Bài 1: Số vô tỉ. Căn bậc hai số học
Hướng dẫn Giải Bài 4 (Trang 33, SGK Toán 7, Tập 1, Bộ Chân Trời Sáng Tạo)
<p><strong>B&agrave;i 4 (Trang 33 SGK To&aacute;n lớp 7 - Bộ Ch&acirc;n Trời S&aacute;ng Tạo Tập 1):</strong></p> <p>H&atilde;y thay dấu ? bằng c&aacute;c số th&iacute;ch hợp:</p> <p><img class="wscnph" style="max-width: 100%;" src="https://static.colearn.vn:8413/v1.0/upload/library/28052022/15-mv5PdR.png" /></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"><mo>+</mo><mo>)</mo><mo>&#160;</mo><mi>n</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mn>121</mn><mo>&#160;</mo><mo>&#8658;</mo><mo>&#160;</mo><msqrt><mi>n</mi><mo>&#160;</mo></msqrt><mo>=</mo><mo>&#160;</mo><msqrt><mn>121</mn></msqrt><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><msqrt><msup><mn>11</mn><mn>2</mn></msup></msqrt><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mn>11</mn><mo>;</mo></math></p> <p><math xmlns="http://www.w3.org/1998/Math/MathML"><mo>+</mo><mo>)</mo><mo>&#160;</mo><msqrt><mi>n</mi></msqrt><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mn>12</mn><mo>&#160;</mo><mo>&#8658;</mo><mo>&#160;</mo><mi>n</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><msup><mn>12</mn><mn>2</mn></msup><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mn>144</mn><mo>;</mo></math></p> <p><math xmlns="http://www.w3.org/1998/Math/MathML"><mo>+</mo><mo>)</mo><mo>&#160;</mo><mi>n</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mn>169</mn><mo>&#160;</mo><mo>&#8658;</mo><mo>&#160;</mo><msqrt><mi>n</mi></msqrt><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><msqrt><mn>169</mn></msqrt><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><msqrt><msup><mn>13</mn><mn>2</mn></msup></msqrt><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mn>13</mn><mo>;</mo></math></p> <p><math xmlns="http://www.w3.org/1998/Math/MathML"><mo>+</mo><mo>)</mo><mo>&#160;</mo><msqrt><mi>n</mi></msqrt><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mn>146</mn><mo>&#160;</mo><mo>&#8658;</mo><mo>&#160;</mo><mi>n</mi><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><msup><mn>146</mn><mn>2</mn></msup><mo>&#160;</mo><mo>=</mo><mo>&#160;</mo><mn>21316</mn></math>.</p> <p>Ta c&oacute; bảng sau:</p> <table style="border-collapse: collapse; width: 99.9308%;" border="1"> <tbody> <tr> <td style="width: 17.5908%; text-align: center;">n</td> <td style="width: 17.5908%; text-align: center;">121</td> <td style="width: 17.5908%; text-align: center;"><strong>144</strong></td> <td style="width: 17.5908%; text-align: center;">169</td> <td style="width: 17.5952%; text-align: center;"><strong>21316</strong></td> </tr> <tr> <td style="width: 17.5908%; text-align: center;"><math xmlns="http://www.w3.org/1998/Math/MathML"><msqrt><mi>n</mi></msqrt></math></td> <td style="width: 17.5908%; text-align: center;"><strong>11</strong></td> <td style="width: 17.5908%; text-align: center;">12</td> <td style="width: 17.5908%; text-align: center;"><strong>13</strong></td> <td style="width: 17.5952%; text-align: center;">146</td> </tr> </tbody> </table>
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