Hướng dẫn giải Bài 4 (Trang 69, SGK Toán 7, Bộ Cánh Diều, Tập 1)

<div data-v-a7c68f28=""><span data-v-a7c68f28="">Hướng dẫn giải Bài 4 (Trang 69, SGK Toán 7, Bộ Cánh Diều, Tập 1)</span></div>

<p><strong>Bài 4 (Trang 69, SGK Toán 7, Bộ Cánh Diều, Tập 1):</strong></p> <p>Tính:</p> <p><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>a</mi><mo>)</mo><mo> </mo><mn>2</mn><mo> </mo><mo>.</mo><mo> </mo><msqrt><mn>6</mn></msqrt><mo> </mo><mo>.</mo><mo> </mo><mo>(</mo><mo>-</mo><msqrt><mn>6</mn></msqrt><mo>)</mo><mo>;</mo><mspace linebreak="newline"/><mspace linebreak="newline"/><mi>b</mi><mo>)</mo><mo> </mo><msqrt><mn>1</mn><mo>,</mo><mn>44</mn></msqrt><mo> </mo><mo>-</mo><mo> </mo><mn>2</mn><mo> </mo><mo>.</mo><msup><mrow><mo> </mo><mo>(</mo><msqrt><mn>0</mn><mo>,</mo><mn>6</mn></msqrt><mo>)</mo></mrow><mn>2</mn></msup><mo>;</mo><mo> </mo><mspace linebreak="newline"/><mspace linebreak="newline"/><mi>c</mi><mo>)</mo><mo> </mo><mn>0</mn><mo>,</mo><mn>1</mn><mo> </mo><mo>.</mo><mo> </mo><msup><mrow><mo>(</mo><msqrt><mn>7</mn></msqrt><mo>)</mo></mrow><mn>2</mn></msup><mo> </mo><mo>+</mo><mo> </mo><msqrt><mn>1</mn><mo>,</mo><mn>69</mn></msqrt><mo>;</mo><mspace linebreak="newline"/><mspace linebreak="newline"/><mi>d</mi><mo>)</mo><mo> </mo><mo>(</mo><mo>-</mo><mn>0</mn><mo>,</mo><mn>1</mn><mo>)</mo><mo> </mo><mo>.</mo><mo> </mo><msup><mrow><mo>(</mo><msqrt><mn>120</mn></msqrt><mo>)</mo></mrow><mn>2</mn></msup><mo> </mo><mo>-</mo><mo> </mo><mfrac><mn>1</mn><mn>4</mn></mfrac><mo>.</mo><msup><mrow><mo>(</mo><msqrt><mn>20</mn></msqrt><mo>)</mo></mrow><mn>2</mn></msup><mo>.</mo></math></p> <p> </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> </mo><mn>2</mn><mo>.</mo><msqrt><mn>6</mn></msqrt><mo>.</mo><mo>(</mo><mo>-</mo><msqrt><mn>6</mn></msqrt><mo>)</mo><mo> </mo><mo>=</mo><mo> </mo><mo>-</mo><mn>2</mn><mo>.</mo><msqrt><mn>6</mn></msqrt><mo>.</mo><msqrt><mn>6</mn></msqrt><mo> </mo><mo>=</mo><mo> </mo><mo>-</mo><mn>2</mn><mo>.</mo><mn>6</mn><mo> </mo><mo>=</mo><mo> </mo><mo>-</mo><mn>12</mn><mo>.</mo></math></p> <p><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>b</mi><mo>)</mo><mo> </mo><msqrt><mn>1</mn><mo>,</mo><mn>44</mn></msqrt><mo>-</mo><mn>2</mn><mo>.</mo><msup><mrow><mo>(</mo><msqrt><mn>0</mn><mo>,</mo><mn>6</mn></msqrt><mo>)</mo></mrow><mn>2</mn></msup><mo> </mo><mo>=</mo><mo> </mo><mn>1</mn><mo>,</mo><mn>2</mn><mo>-</mo><mn>2</mn><mo>.</mo><mn>0</mn><mo>,</mo><mn>6</mn><mo> </mo><mo>=</mo><mo> </mo><mn>1</mn><mo>,</mo><mn>2</mn><mo>-</mo><mn>1</mn><mo>,</mo><mn>2</mn><mo> </mo><mo>=</mo><mo> </mo><mn>0</mn><mo>.</mo></math></p> <p><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>c</mi><mo>)</mo><mo> </mo><mn>0</mn><mo>,</mo><mn>1</mn><mo>.</mo><msup><mrow><mo>(</mo><msqrt><mn>7</mn></msqrt><mo>)</mo></mrow><mn>2</mn></msup><mo>+</mo><msqrt><mn>1</mn><mo>,</mo><mn>69</mn></msqrt><mo> </mo><mo>=</mo><mo> </mo><mn>0</mn><mo>,</mo><mn>1</mn><mo>.</mo><mn>7</mn><mo> </mo><mo>+</mo><mo> </mo><mn>1</mn><mo>,</mo><mn>3</mn><mo> </mo><mo>=</mo><mo> </mo><mn>0</mn><mo>,</mo><mn>7</mn><mo> </mo><mo>+</mo><mo> </mo><mn>1</mn><mo>,</mo><mn>3</mn><mo> </mo><mo>=</mo><mo> </mo><mn>2</mn><mo>.</mo></math></p> <p><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>d</mi><mo>)</mo><mo> </mo><mo>(</mo><mo>-</mo><mn>0</mn><mo>,</mo><mn>1</mn><mo>)</mo><mo>.</mo><msup><mrow><mo>(</mo><msqrt><mn>120</mn></msqrt><mo>)</mo></mrow><mn>2</mn></msup><mo>-</mo><mfrac><mn>1</mn><mn>4</mn></mfrac><mo>.</mo><msup><mrow><mo>(</mo><msqrt><mn>20</mn></msqrt><mo>)</mo></mrow><mn>2</mn></msup><mo> </mo><mo>=</mo><mo> </mo><mo>(</mo><mo>-</mo><mn>0</mn><mo>,</mo><mn>1</mn><mo>)</mo><mo>.</mo><mn>120</mn><mo> </mo><mo>-</mo><mo> </mo><mfrac><mn>1</mn><mn>4</mn></mfrac><mo>.</mo><mn>20</mn><mo> </mo><mo>=</mo><mo> </mo><mo>-</mo><mn>12</mn><mo> </mo><mo>-</mo><mo> </mo><mn>5</mn><mo> </mo><mo>=</mo><mo> </mo><mo>-</mo><mn>17</mn><mo>.</mo></math></p>

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<div data-v-a7c68f28=""><span data-v-a7c68f28="">Hướng dẫn giải Bài 1 (Trang 69, SGK Toán 7, Bộ Cánh Diều, Tập 1)</span></div>