Luyện Tập
Hướng dẫn giải Bài 23 (Trang 17 SGK Toán Đại số 8, Tập 2)
<p>Giải phương trình</p>
<p><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>a</mi><mo>.</mo><mo> </mo><mo>(</mo><mn>2</mn><mi>x</mi><mo>-</mo><mn>9</mn><mo>)</mo><mo>=</mo><mn>3</mn><mi>x</mi><mo>(</mo><mi>x</mi><mo>-</mo><mn>5</mn><mo>)</mo><mspace linebreak="newline"/><mi>b</mi><mo>.</mo><mo> </mo><mn>0</mn><mo>,</mo><mn>5</mn><mi>x</mi><mo>(</mo><mi>x</mi><mo>-</mo><mn>3</mn><mo>)</mo><mo>=</mo><mo>(</mo><mi>x</mi><mo>-</mo><mn>3</mn><mo>)</mo><mo>(</mo><mn>1</mn><mo>,</mo><mn>5</mn><mi>x</mi><mo>-</mo><mn>1</mn><mo>)</mo><mspace linebreak="newline"/><mi>c</mi><mo>.</mo><mo> </mo><mn>3</mn><mi>x</mi><mo>-</mo><mn>15</mn><mo>=</mo><mn>2</mn><mi>x</mi><mo>(</mo><mi>x</mi><mo>-</mo><mn>5</mn><mo>)</mo><mspace linebreak="newline"/><mi>d</mi><mo>.</mo><mo> </mo><mfrac><mn>3</mn><mn>7</mn></mfrac><mi>x</mi><mo>-</mo><mn>1</mn><mo>=</mo><mfrac><mn>1</mn><mn>7</mn></mfrac><mi>x</mi><mo>(</mo><mn>3</mn><mi>x</mi><mo>-</mo><mn>7</mn><mo>)</mo><mspace linebreak="newline"/></math></p>
<p><strong>Giải</strong></p>
<p><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>a</mi><mo>)</mo><mo> </mo><mi>x</mi><mo>(</mo><mn>2</mn><mi>x</mi><mo>-</mo><mn>9</mn><mo>)</mo><mo>=</mo><mn>3</mn><mi>x</mi><mo>(</mo><mi>x</mi><mo>-</mo><mn>5</mn><mo>)</mo><mo>⇔</mo><mi>x</mi><mo>(</mo><mn>2</mn><mi>x</mi><mo>-</mo><mn>9</mn><mo>)</mo><mo>-</mo><mn>3</mn><mi>x</mi><mo>(</mo><mi>x</mi><mo>-</mo><mn>5</mn><mo>)</mo><mo>=</mo><mn>0</mn><mspace linebreak="newline"/><mo>⇔</mo><mi>x</mi><mo>(</mo><mo>(</mo><mn>2</mn><mi>x</mi><mo>-</mo><mn>9</mn><mo>-</mo><mn>3</mn><mo>(</mo><mi>x</mi><mo>-</mo><mn>5</mn><mo>)</mo><mo>)</mo><mo>=</mo><mn>0</mn><mspace linebreak="newline"/><mo>⇔</mo><mi>x</mi><mo>(</mo><mn>2</mn><mi>x</mi><mo>-</mo><mn>9</mn><mo>-</mo><mn>3</mn><mi>x</mi><mo>+</mo><mn>15</mn><mo>)</mo><mo>=</mo><mn>0</mn><mspace linebreak="newline"/><mo>⇔</mo><mi>x</mi><mo>(</mo><mn>6</mn><mo>-</mo><mi>x</mi><mo>)</mo><mo>=</mo><mn>0</mn><mspace linebreak="newline"/><mo>⇔</mo><mi>x</mi><mo>=</mo><mn>0</mn><mo> </mo><mi>h</mi><mi>o</mi><mi>a</mi><mi>c</mi><mo> </mo><mn>6</mn><mo>-</mo><mi>x</mi><mo>=</mo><mn>0</mn></math></p>
<p>tập nghiệm S = {0;6}</p>
<p>b. <math xmlns="http://www.w3.org/1998/Math/MathML"><mn>0</mn><mo>,</mo><mn>5</mn><mi>x</mi><mo>(</mo><mi>x</mi><mo>-</mo><mn>3</mn><mo>)</mo><mo>=</mo><mo>(</mo><mi>x</mi><mo>-</mo><mn>3</mn><mo>)</mo><mo>(</mo><mn>1</mn><mo>,</mo><mn>5</mn><mi>x</mi><mo>-</mo><mn>1</mn><mo>)</mo><mo>⇔</mo><mo>(</mo><mi>x</mi><mo>-</mo><mn>3</mn><mo>)</mo><mfenced open="[" close="]"><mrow><mn>0</mn><mo>,</mo><mn>5</mn><mi>x</mi><mo>-</mo><mo>(</mo><mn>1</mn><mo>,</mo><mn>5</mn><mi>x</mi><mo>-</mo><mn>1</mn><mo>)</mo></mrow></mfenced><mo>=</mo><mn>0</mn><mspace linebreak="newline"/><mo>⇔</mo><mo>(</mo><mi>x</mi><mo>-</mo><mn>3</mn><mo>)</mo><mo>(</mo><mn>1</mn><mo>-</mo><mi>x</mi><mo>)</mo><mo>=</mo><mn>0</mn><mo>⇔</mo><mi>x</mi><mo>-</mo><mn>3</mn><mo>=</mo><mn>0</mn><mo> </mo><mi>h</mi><mi>o</mi><mi>a</mi><mi>c</mi><mo> </mo><mn>1</mn><mo>-</mo><mi>x</mi><mo>=</mo><mn>0</mn></math></p>
<p>tập nghiệm S = {1;3}</p>
<p>c. <math xmlns="http://www.w3.org/1998/Math/MathML"><mn>3</mn><mi>x</mi><mo>-</mo><mn>15</mn><mo>=</mo><mn>2</mn><mi>x</mi><mo>(</mo><mi>x</mi><mo>-</mo><mn>5</mn><mo>)</mo><mo>⇔</mo><mo>(</mo><mi>x</mi><mo>-</mo><mn>5</mn><mo>)</mo><mo>(</mo><mn>3</mn><mo>-</mo><mn>2</mn><mi>x</mi><mo>)</mo><mo>=</mo><mn>0</mn><mo>⇔</mo><mi>x</mi><mo>-</mo><mn>5</mn><mo>=</mo><mn>0</mn><mo> </mo><mi>h</mi><mi>o</mi><mi>a</mi><mi>c</mi><mo> </mo><mn>3</mn><mo>-</mo><mn>2</mn><mi>x</mi><mo>=</mo><mn>0</mn></math></p>
<p>tập nghiệm <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>S</mi><mo>=</mo><mfenced open="{" close="}"><mrow><mn>5</mn><mo>;</mo><mfrac><mn>3</mn><mn>2</mn></mfrac></mrow></mfenced></math></p>
<p>d. <math xmlns="http://www.w3.org/1998/Math/MathML"><mfrac><mn>3</mn><mn>7</mn></mfrac><mi>x</mi><mo>-</mo><mn>1</mn><mo>=</mo><mfrac><mn>1</mn><mn>7</mn></mfrac><mi>x</mi><mo>(</mo><mn>3</mn><mi>x</mi><mo>-</mo><mn>7</mn><mo>)</mo><mo>⇔</mo><mo>(</mo><mfrac><mn>3</mn><mn>7</mn></mfrac><mi>x</mi><mo>-</mo><mn>1</mn><mo>)</mo><mo>(</mo><mn>1</mn><mo>-</mo><mi>x</mi><mo>)</mo><mo>=</mo><mn>0</mn></math></p>
<p>Tập nghiệm <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>S</mi><mo>=</mo><mfenced open="{" close="}"><mrow><mn>1</mn><mo>;</mo><mfrac><mn>7</mn><mn>3</mn></mfrac></mrow></mfenced></math></p>
Hướng dẫn Giải Bài 23 (Trang 17, SGK Toán 8, Tập 2, Phần Đại Số)
GV: 
GV colearn
GV colearn
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<div class="n-content-exercise">Hướng dẫn giải Bài 24 (Trang 17 SGK Toán Đại số 8, Tập 2)</div>
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Xem lời giải
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<div class="n-content-exercise">Hướng dẫn giải Bài 25 (Trang 17 SGK Toán Đại số 8, Tập 2)</div>
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Xem lời giải
Video hướng dẫn giải bài tập
Hướng dẫn Giải Bài 23 (Trang 17, SGK Toán 8, Tập 2, Phần Đại Số)
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