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		<h1>DẠNG BÀI TẬP VỀ CHUYỂN ĐỘNG THẲNG ĐỀU</h1>
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			<li>Thứ bảy - 14/11/2020 09:35</li>
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			Bài tập 1: Lúc 6 giờ, một người đi xe đạp xuất phát từ A đi về B với vận tốc v1= 12km/h.Sau đó 2 giờ một người đi bộ từ B về A với vận tốc v2=4km/h. Biết AB = 48km.<br />a) Hai người gặp nhau lúc mấy giờ?nơi gặp nhau cách A bao nhiêu km?<br />b) Nếu người đi xe đạp ,sau khi đi được 2km rồi ngồi nghỉ 1 giờ thì 2 người gặp nhau lúc mấy giờ?nơi gặp nhau cách A bao nhiêu km?
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			<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif">giải</span></span></span></span><br  />
<span style="font-size:14pt"><span style="line-height:150%"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><span lang="NL" style="font-size:13.0pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Lập</span></span></span></span><span lang="NL" style="font-size:13.0pt"><span style="line-height:150%"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="color:black"> phương trình đường đi của 2 xe:</span></span></span></span></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="color:black">a) s<sub>1</sub> =v<sub>1</sub>t; s<sub>2</sub>= v<sub>2</sub>(t-2) </span></span></span><span lang="NL" style="font-size:13.0pt"><span style="font-family:Symbol"><span style="color:black">Þ</span></span></span><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="color:black"> s<sub>1</sub>+s<sub>2</sub>=s<sub>AB</sub> </span></span></span><span lang="NL" style="font-size:13.0pt"><span style="font-family:Symbol"><span style="color:black">Û</span></span></span><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="color:black"> v<sub>1</sub>t+v<sub>2</sub>(t-2) = s<sub>AB</sub></span></span></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="color:black">&nbsp; Giải phương trình </span></span></span><span lang="NL" style="font-size:13.0pt"><span style="font-family:Symbol"><span style="color:black">Þ</span></span></span><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="color:black"> t &nbsp;= 3,5 (h) </span></span></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<span lang="NL" style="font-size:13.0pt"><span style="font-family:Symbol"><span style="color:black">Þ</span></span></span><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="color:black"> s<sub>1 </sub>=&nbsp; 42(km) , s<sub>2 </sub>&nbsp;=&nbsp; 6(km)</span></span></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;<span lang="NL" style="font-size:13.0pt"><span style="font-family:Symbol"><span style="color:black">Þ</span></span></span><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="color:black"> Thời điểm gặp nhau lúc 9h30 phút </span></span></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; và vị trí 2 xe gặp nhau cách A 42 (km).</span></span></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="color:black">b)&nbsp; Gọi t là thời gian tính từ lúc người đi xe xuất phát đến lúc 2 người gặp nhau ta có phương trình</span></span></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="color:black">s<sub>1</sub>= v<sub>1</sub> (t- 1);&nbsp; s<sub>2</sub>= v<sub>2</sub> (t-2) ;&nbsp; s<sub>1</sub> + s<sub>2</sub> = s<sub>AB</sub> </span></span></span><span lang="NL" style="font-size:13.0pt"><span style="font-family:Symbol"><span style="color:black">Þ</span></span></span><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="color:black"> v<sub>1</sub> (t-1)+ v<sub>2</sub> (t-2) = 48 </span></span></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span lang="NL" style="font-size:13.0pt"><span style="font-family:Symbol"><span style="color:black">Þ</span></span></span><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="color:black"> t=4,25h=4h 15ph</span></span></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><span lang="NL" style="font-size:13.0pt"><span style="font-family:Symbol"><span style="color:black">Þ</span></span></span><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="color:black">thời điểm gặp nhau T=10h 15 ph</span></span></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="color:black">nơigặp nhau cách A: x<sub>n</sub>= s<sub>1</sub>=12(4,25-1)=39km.</span></span></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><b><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif">Bài tập 2:</span></span></b><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif">&nbsp; Lúc 7 giờ, hai ô tô cùng khởi hành từ 2 địa điểm A, B cách nhau 180km và đi ngược chiều nhau. Vận tốc của xe đi từ A đến B là 40km/h, vận tốc của xe đi từ B đến A là 32km/h. </span></span></span></span>
<ol style="list-style-type:lower-alpha">
	<li style="text-align:justify"><span style="font-size:14pt"><span style="tab-stops:list 41.55pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif">Tính khoảng cách giữa 2 xe vào lúc 8 giờ.</span></span></span></span></span></li>
	<li style="text-align:justify"><span style="font-size:14pt"><span style="tab-stops:list 41.55pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif">Đến mấy giờ thì 2 xe gặp nhau, vị trí hai xe lúc gặp nhau cách A bao nhiêu km ?</span></span></span></span></span></li>
</ol>

<div style="text-align:justify"><span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif">  </span></span><br  />
<img alt="" height="80" src="https://khobaitap.com/uploads/news/2020_11/image_174.png" width="281" /><br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif">a/ Quãng đường xe đi từ A đến thời điểm 8h là </span></span></span></span><br  />
<span style="font-size:14pt"><span style="tab-stops:356.2pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; S<sub>Ac</sub>&nbsp; = 40.1 = 40 km&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif">&nbsp;&nbsp; Quãng đường xe đi từ B đến thời điểm 8h là :</span></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; S<sub>AD</sub>&nbsp; = 32.1 = 32 km</span></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif">&nbsp;&nbsp; Vậy khoảng cách 2 xe lúc 8 giờ là :</span></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; S<sub>CD</sub> = S<sub>AB</sub> -&nbsp; S<sub>Ac</sub> -&nbsp; S<sub>AD</sub>&nbsp; = 180 - 40 - 32 = 108( km).</span></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif">b/&nbsp; Gọi t là khoảng thời gian 2 xe từ lúc bắt đầu đi đến khi gặp nhau, Ta có.</span></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif">&nbsp;Quãng đường từ A đến khi gặp nhau là :</span></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; S<sub>AE</sub> = 40.t&nbsp;&nbsp;&nbsp; (km)</span></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif">&nbsp;Quãng đường từ B đến khi gặp nhau là :</span></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; S<sub>BE</sub> = 32.t&nbsp;&nbsp;&nbsp; (km)</span></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif">Mà : S<sub>AE</sub>&nbsp; +&nbsp; S<sub>BE</sub>&nbsp; <b>&nbsp;= </b>&nbsp;S<sub>A<b>B</b></sub>&nbsp;&nbsp; Hay&nbsp;&nbsp; 40t + 32t&nbsp; =180&nbsp; =&gt; 72t = 180&nbsp; =&gt;&nbsp; t = 2,5(h)</span></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><b><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif">Vậy</span></span></b><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif"> : -&nbsp;&nbsp; Hai xe gặp nhau lúc&nbsp; :&nbsp;&nbsp; 7 + 2,5 = 9,5 (giờ)&nbsp;&nbsp; Hay&nbsp; 9 giờ 30 phút</span></span></span></span><br  />
<span style="font-size:14pt"><span style="tab-stops:184.05pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; -&nbsp; Quãng đường từ A đến điểm gặp nhau là :S<sub>AE </sub>=&nbsp; 40. 2,5 =100km</span></span></span></span></span><br  />
<br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><b><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif">Bài tập 3:</span></span></b><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif"> Tại hai đầu A và B của đoạn đường dài 5 km có hai người khởi hành cùng một lúc chạy ngược chiều nhau với vận tốc v<sub>A </sub>&nbsp;= 12 km/h; v<b><sub>B</sub> = </b>8 km/h. Một con chó cùng xuất phát và chạy cùng chiều với người A với vận tốc 16 km/h. Trên đường khi gặp người B nó lập tức quay lại và khi gặp người A nó lại lập tức quay lại và cứ chạy đi chạy lại như thế cho đến khi cả ba cùng gặp nhau.</span></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif">a) Tính tổng đoạn đường mà con chó đã chạy.</span></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif">b) Chỗ gặp nhau của hai người cách A bao nhiêu?</span></span></span></span><br  />
<img alt="" height="283" src="https://khobaitap.com/uploads/news/2020_11/image_179.png" width="510" /></div>
<br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><b><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif">Bài tập 4</span></span></b><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif">:Hồng và Hương cùng khởi hành từ 2 điểm A và B cách nhau 150 km.Lúc đầu Hồng đi xe máy với vận tốc 48 km/h.Hương đi ô tô và khởi hành sau Hồng 30 phút với vận tốc 20 m/s.</span></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif">a)Hỏi Hương phải đi mất bao lâu thì đuổi kịp Hồng?</span></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif">b)Khi gặp nhau Hương và Hồng cách B bao nhiêu km?</span></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif">c)Để đến B cùng lúc với Hồng thì Hương phải khởi hành lúc mấy giờ?</span></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif">a) Quãng đường Hồng đi trong 30 phút đầu :S<sub>1</sub> = V<sub>1</sub>.t<sub>1</sub>= 48.0,5 =24km</span></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif">Gọi S&nbsp; là khoảng cách từ điểm A đến diểm Hương đuổi kịp Hồng và t là</span></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif">&nbsp;thời gian Hương đi đoạn đường S<sub>2</sub> thì</span></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; S<sub>2</sub> =V<sub>2</sub>.t<sub>2</sub> =72.t<sub>2</sub>&nbsp;&nbsp; và S <sub>2</sub>=24+ 48.t<sub>2</sub>&nbsp; </span></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="position:relative"><span style="top:3.0pt"><img alt="" src="https://khobaitap.com/file:///C:/Users/Admin/AppData/Local/Temp/msohtmlclip1/01/clip_image002.gif" style="width:20px; height:16px" /></span></span>72t<sub>2</sub> =24+48t<sub>2</sub></span></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <span style="position:relative"><span style="top:3.0pt"><img alt="" src="https://khobaitap.com/file:///C:/Users/Admin/AppData/Local/Temp/msohtmlclip1/01/clip_image002.gif" style="width:20px; height:16px" /></span></span>&nbsp;t<sub>2</sub> =1h <span style="position:relative"><span style="top:3.0pt"><img alt="" src="https://khobaitap.com/file:///C:/Users/Admin/AppData/Local/Temp/msohtmlclip1/01/clip_image002.gif" style="width:20px; height:16px" /></span></span>S <sub>2</sub>=72 km</span></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif">Vậy sau 1h Hương đuổi kịp Hồng</span></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif">b) Địa điểm gặp nhau cách B 1 đoạn :&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 150- 72=78 km</span></span></span></span><br  />
<img alt="" height="122" src="https://khobaitap.com/uploads/news/2020_11/image_176.png" width="504" /><br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><b><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif">Bài tập 5</span></span></b><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif">:Tại hai điểm A, B cách nhau 72 km. Cùng lúc một ô tô đi từ A và một xe đạp đi từ B ngược chiều nhau và gặp nhau sau 1 giờ 12 phút. Sau đó, ô tô tiếp tục về B rồi quay lại với vận tốc cũ và gặp xe đạp sau 48 phút, kể từ lần gặp trước.</span></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif">a)Tính vận tốc của ô tô và xe đạp.</span></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;.VnTime&#039;,sans-serif"><span lang="NL" style="font-size:13.0pt"><span style="font-family:&#039;Times New Roman&#039;,serif">b) &nbsp;Nếu ô tô tiếp tục đi về A rồi quay lại thì sẽ gặp người đi xe đạp sau bao lâu kể từ lần gặp thứ hai.</span></span></span></span><br  />
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