Bài 2: Tập hợp R các số thực
<div data-v-a7c68f28=""><span data-v-a7c68f28="">Hướng dẫn giải Bài 4 (Trang 42, SGK Toán 7, Bộ Cánh Diều, Tập 1)</span></div>
<p><strong>&nbsp;B&agrave;i 4 (Trang 42 SGK To&aacute;n 7 - Bộ C&aacute;nh Diều, Tập 1):</strong></p> <p>T&igrave;m chữ số th&iacute;ch hợp cho ?</p> <p><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>a</mi><mo>)</mo><mo>&#160;</mo><mo>-</mo><mn>5</mn><mo>,</mo><mn>02</mn><mo>&#60;</mo><mo>-</mo><mn>5</mn><mo>,</mo><mo>&#160;</mo><mo>?</mo><mn>1</mn><mo>;</mo></math></p> <p><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>b</mi><mo>)</mo><mo>&#160;</mo><mo>-</mo><mn>3</mn><mo>,</mo><mn>7</mn><mo>?</mo><mn>8</mn><mo>&#8201;</mo><mo>&#62;</mo><mo>-</mo><mn>3</mn><mo>,</mo><mn>715</mn><mo>;</mo></math></p> <p><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>c</mi><mo>)</mo><mo>&#160;</mo><mo>-</mo><mn>0</mn><mo>,</mo><mn>5</mn><mo>?</mo><mo>(</mo><mn>742</mn><mo>)</mo><mo>&#60;</mo><mo>-</mo><mn>0</mn><mo>,</mo><mn>59653</mn><mo>;</mo></math></p> <p><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>d</mi><mo>)</mo><mo>&#160;</mo><mo>-</mo><mn>1</mn><mo>,</mo><mo>(</mo><mn>4</mn><mo>?</mo><mo>)</mo><mo>&#60;</mo><mo>-</mo><mn>1</mn><mo>,</mo><mn>49</mn><mo>.</mo></math></p> <p>&nbsp;</p> <p><span style="text-decoration: underline;"><em><strong>Hướng dẫn giải:</strong></em></span></p> <p><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>a</mi><mo>)</mo><mo>&#160;</mo><mo>-</mo><mn>5</mn><mo>,</mo><mn>02</mn><mo>&#60;</mo><mo>-</mo><mn>5</mn><mo>,</mo><mo>&#160;</mo><mn mathvariant="bold" mathcolor="#FF0000">0</mn><mn>1</mn></math>;</p> <p><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>b</mi><mo>)</mo><mo>&#160;</mo><mo>-</mo><mn>3</mn><mo>,</mo><mn>7</mn><mn mathvariant="bold" mathcolor="#FF0000">0</mn><mn>8</mn><mo>&#8201;</mo><mo>&#62;</mo><mo>-</mo><mn>3</mn><mo>,</mo><mn>715</mn></math></p> <p><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>c</mi><mo>)</mo><mo>&#160;</mo><mo>-</mo><mn>0</mn><mo>,</mo><mn>5</mn><mn mathvariant="bold" mathcolor="#FF0000">9</mn><mo>(</mo><mn>742</mn><mo>)</mo><mo>&#60;</mo><mo>-</mo><mn>0</mn><mo>,</mo><mn>59653</mn><mo>;</mo></math></p> <p><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>d</mi><mo>)</mo><mo>&#160;</mo><mo>-</mo><mn>1</mn><mo>,</mo><mo>(</mo><mn>4</mn><mn mathvariant="bold" mathcolor="#FF0000">9</mn><mo>)</mo><mo>&#60;</mo><mo>-</mo><mn>1</mn><mo>,</mo><mn>49</mn><mo>.</mo></math></p>
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