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		<h1>TẬP HỢP Z CÁC SÔ NGUYÊN</h1>
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			<li>Thứ sáu - 09/10/2020 10:36</li>
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			Câu 1: Lấy VD thực tế trong đó có số nguyên âm, giải thích ý nghĩa của số nguyên âm đó.<br />Câu 2: Tập hợp Z các số nguyên bao gồm những số nào?<br />Câu 3: Cho biết trên trục số hai số đối nhau có đặc điểm gì?<br />Câu 4: Nói tập hợp Z bao gồm hai bộ phận là số tự nhiên và số nguyên âm đúng không?<br />Câu 5: Nhắc lại cách so sánh hai số nguyên a và b trên trục số?
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			<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><span style="font-size:12.0pt">Bài 1:</span></b><span style="font-size:12.0pt"> &nbsp;Cho tập hợp M = { 0; -10; -8; 4; 2}</span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">a/ Viết tập hợp N gồm các phần tử là số đối của các phần tử thuộc tập M.</span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">b/ Viết tập hợp P gồm các phần tử của M và N</span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><i><span style="font-size:12.0pt">Hướng dẫn</span></i></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">a/ N = {0; 10; 8; -4; -2}</span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">b/ P = {0; -10; -8; -4; -2; 10; 8; 4; 2}</span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><span style="font-size:12.0pt">Bài 2:</span></b><span style="font-size:12.0pt"> &nbsp;Trong các câu sau câu nào đúng? câu nào sai?</span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">a/ Mọi số tự nhiên đều là số nguyên. </span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">b/ Mọi số nguyên đều là số tự nhiên.</span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">c/ Có những số nguyên đồng thời là số tự nhiên.</span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">d/ Có những số nguyên không là số tự nhiên.</span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">e/ Số đối của 0 là 0, số đối của a là (–a).</span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">g/ Khi biểu diễn các số (-5) và (-3) trên trục số thì điểm (-3) ở bên trái điểm (-5).</span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">h/ Có những số không là số tự nhiên cũng không là số nguyên.</span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">ĐS: Các câu sai: b/ g/</span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><span style="font-size:12.0pt">Bài 3:</span></b><span style="font-size:12.0pt"> &nbsp;Trong các câu sau câu nào đúng? câu nào sai?</span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">a/ Bất kỳ số nguyên dương nào xũng lớn hơn số nguyên ân.</span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">b/ Bất kỳ số tự nhiên nào cũng lớn hơn số nguyên âm.</span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">c/ Bất kỳ số nguyên dương nào cũng lớn hơn số tự nhiên.</span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">d/ Bất kỳ số tự nhiên nào cũng lớn hơn số nguyên dương.</span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">e/ Bất kỳ số nguyên âm nào cũng nhỏ hơn 0.</span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">ĐS: Các câu sai: d/</span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><span style="font-size:12.0pt">Bài 4:</span></b><span style="font-size:12.0pt"> a/ Sắp xếp các số nguyên sau theo thứ tự tăng dần</span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">2, 0, -1, -5, -17, 8</span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">b/ Sắp xếp các số nguyên sau theo thứ tự giảm dần</span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">-103, -2004, 15, 9, -5, 2004</span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><i><span style="font-size:12.0pt">Hướng dẫn</span></i></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">a/ -17. -5, -1, 0, 2, 8</span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">b/ 2004, 15, 9, -5, -103, -2004</span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><span style="font-size:12.0pt">Bài 5:</span></b><span style="font-size:12.0pt"> &nbsp;Trong các cách viết sau, cách viết nào đúng?</span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">a/ -3 &lt; 0</span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">b/ 5 &gt; -5</span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">c/ -12 &gt; -11</span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">d/ |9| = 9</span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">e/ |-2004| &lt; 2004</span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">f/ |-16| &lt; |-15|</span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">ĐS: Các câu sai: c/ e/ f/</span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><span style="font-size:12.0pt">Bài 6:</span></b><span style="font-size:12.0pt"> Tìm x biết:</span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">a/ |x – 5| = 3</span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">b/ |1 – x| = 7</span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">c/ |2x + 5| = 1</span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><i><span style="font-size:12.0pt">Hướng dẫn</span></i></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">a/ |x – 5| = 3 nên x – 5 = ± 3</span></span></span>
<ul>
	<li><span style="font-size:14pt"><span style="tab-stops:list 52.35pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">x – 5 = 3 <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;x = 8</span></span></span></span></li>
	<li><span style="font-size:14pt"><span style="tab-stops:list 52.35pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">x – 5 = -3 <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>x = 2</span></span></span></span></li>
</ul>
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">b/ |1 – x| = 7 nên 1 – x = ± 7</span></span></span>

<ul>
	<li><span style="font-size:14pt"><span style="tab-stops:list 52.35pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">1 – x = 7 <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;x = -6</span></span></span></span></li>
	<li><span style="font-size:14pt"><span style="tab-stops:list 52.35pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">1 – x&nbsp; = -7 <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>x = 8</span></span></span></span></li>
</ul>
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">c/ x = -2, x = 3</span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><b><span style="font-size:12.0pt">Bài 7:</span></b><span style="font-size:12.0pt"> &nbsp;So sánh</span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">a/ |-2|<sup>300</sup> và |-4|<sup>150</sup> </span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">b/ |-2|<sup>300</sup>&nbsp; và |-3|<sup>200</sup></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">&nbsp;<i>Hướng dẫn</i></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">a/ Ta có |-2|<sup>300</sup> = 2<sup>300</sup></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">| -4 |<sup>150</sup> = 4<sup>150</sup> = 2<sup>300</sup> Vậy |-2|<sup>300</sup>&nbsp; = |-4|<sup>150</sup> </span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">b/ |-2|<sup>300</sup> =&nbsp; 2<sup>300</sup> = (2<sup>3</sup>)<sup>100</sup> = 8<sup>100</sup></span></span></span><br  />
<span style="font-size:14pt"><span style="font-family:&#039;Times New Roman&#039;,serif"><span style="font-size:12.0pt">&nbsp;-3|<sup>200</sup> = 3<sup>200</sup> = (3<sup>2</sup>)<sup>100</sup> = 9<sup>100</sup><br  />
Vì 8 &lt; 9 nên 8<sup>100</sup> &lt; 9<sup>100</sup> suy ra |-2|<sup>300</sup>&nbsp; &lt; |-3|<sup>200</sup> </span></span></span>

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