Bài 2: Căn thức bậc hai và hằng đẳng thức <math xmlns="http://www.w3.org/1998/Math/MathML"><msqrt><msup><mi>A</mi><mn>2</mn></msup></msqrt><mo>=</mo><mfenced open="|" close="|"><mi>A</mi></mfenced></math>
Hướng dẫn giải Bài 7 (Trang 10 SGK Toán 9, Tập 1)
<p><strong>Bài 7 (Trang 10 SGK Toán 9, Tập 1):</strong></p>
<p>Tính:</p>
<p>a)<math xmlns="http://www.w3.org/1998/Math/MathML"><msqrt><mn>0</mn><mo>,</mo><msup><mn>1</mn><mn>2</mn></msup></msqrt></math></p>
<p>b) <math xmlns="http://www.w3.org/1998/Math/MathML"><msup><msqrt><mfenced><mrow><mo>-</mo><mn>0</mn><mo>,</mo><mn>3</mn></mrow></mfenced></msqrt><mn>2</mn></msup></math></p>
<p>c) <math xmlns="http://www.w3.org/1998/Math/MathML"><mo>-</mo><msqrt><msup><mfenced><mrow><mo>-</mo><mn>1</mn><mo>,</mo><mn>3</mn></mrow></mfenced><mn>2</mn></msup></msqrt></math></p>
<p>d) <math xmlns="http://www.w3.org/1998/Math/MathML"><mo>-</mo><mn>0</mn><mo>,</mo><mn>4</mn><msup><msqrt><mfenced><mrow><mo>-</mo><mn>0</mn><mo>,</mo><mn>4</mn></mrow></mfenced></msqrt><mn>2</mn></msup></math></p>
<p> </p>
<p><strong><span style="text-decoration: underline;"><em>Hướng dẫn giải:</em></span></strong></p>
<p>a) <math xmlns="http://www.w3.org/1998/Math/MathML"><msqrt><mn>0</mn><mo>,</mo><msup><mn>1</mn><mn>2</mn></msup></msqrt><mo> </mo><mo>=</mo><mo> </mo><mfenced open="|" close="|"><mrow><mn>0</mn><mo>,</mo><mn>1</mn></mrow></mfenced><mo> </mo><mo>=</mo><mo> </mo><mn>0</mn><mo>,</mo><mn>1</mn></math></p>
<p>b) <math xmlns="http://www.w3.org/1998/Math/MathML"><msup><msqrt><mfenced><mrow><mo>-</mo><mo> </mo><mn>0</mn><mo>,</mo><mn>3</mn></mrow></mfenced></msqrt><mn>2</mn></msup><mo> </mo><mo>=</mo><mo> </mo><mfenced open="|" close="|"><mrow><mo>-</mo><mn>0</mn><mo>,</mo><mn>3</mn></mrow></mfenced><mo> </mo><mo>=</mo><mo> </mo><mn>0</mn><mo>,</mo><mn>3</mn></math></p>
<p>c) <math xmlns="http://www.w3.org/1998/Math/MathML"><mo>-</mo><msqrt><msup><mfenced><mrow><mo>-</mo><mn>1</mn><mo>,</mo><mn>3</mn></mrow></mfenced><mn>2</mn></msup></msqrt><mo> </mo><mo>=</mo><mo>-</mo><mfenced open="|" close="|"><mrow><mn>1</mn><mo>,</mo><mn>3</mn></mrow></mfenced><mo> </mo><mo>=</mo><mo> </mo><mo>-</mo><mn>1</mn><mo>,</mo><mn>3</mn></math></p>
<p>d) <math xmlns="http://www.w3.org/1998/Math/MathML"><mo>-</mo><mn>0</mn><mo>,</mo><mn>4</mn><msqrt><msup><mfenced><mrow><mo>-</mo><mn>0</mn><mo>,</mo><mn>4</mn></mrow></mfenced><mn>2</mn></msup></msqrt><mo> </mo><mo>=</mo><mo>-</mo><mn>0</mn><mo>,</mo><mn>4</mn><mfenced open="|" close="|"><mrow><mo>-</mo><mo> </mo><mn>0</mn><mo>,</mo><mn>4</mn></mrow></mfenced><mo> </mo><mo>=</mo><mo> </mo><mo>-</mo><mo> </mo><mn>0</mn><mo>,</mo><mn>16</mn></math></p>
Hướng dẫn Giải Bài 7 (trang 10, SGK Toán 9, Tập 1)
GV:
GV colearn
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