Luyện Tập Chung
Hướng dẫn giải Bài 18 (Trang 14 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><mfrac><mi>x</mi><mn>3</mn></mfrac><mo>-</mo><mfrac><mrow><mn>2</mn><mi>x</mi><mo>+</mo><mn>1</mn></mrow><mn>2</mn></mfrac><mo>=</mo><mfrac><mi>x</mi><mn>6</mn></mfrac><mo>-</mo><mi>x</mi><mo>;</mo><mspace linebreak="newline"/><mi>b</mi><mo>)</mo><mo> </mo><mfrac><mrow><mn>2</mn><mo>+</mo><mi>x</mi></mrow><mn>5</mn></mfrac><mo>-</mo><mn>0</mn><mo>,</mo><mn>5</mn><mi>x</mi><mo>=</mo><mfrac><mrow><mn>1</mn><mo>-</mo><mn>2</mn><mi>x</mi></mrow><mn>4</mn></mfrac><mo>+</mo><mn>0</mn><mo>,</mo><mn>25</mn></math></p>
<p><strong>Giải</strong></p>
<p><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>a</mi><mo>)</mo><mo> </mo><mfrac><mi>x</mi><mn>3</mn></mfrac><mo>-</mo><mfrac><mrow><mn>2</mn><mi>x</mi><mo>+</mo><mn>1</mn></mrow><mn>2</mn></mfrac><mo>=</mo><mfrac><mi>x</mi><mn>6</mn></mfrac><mo>-</mo><mi>x</mi><mo>⇔</mo><mfrac><mrow><mn>2</mn><mi>x</mi></mrow><mn>6</mn></mfrac><mo>-</mo><mfrac><mrow><mn>3</mn><mo>(</mo><mn>2</mn><mi>x</mi><mo>+</mo><mn>1</mn><mo>)</mo></mrow><mn>6</mn></mfrac><mo>=</mo><mfrac><mi>x</mi><mn>6</mn></mfrac><mo>-</mo><mfrac><mrow><mn>6</mn><mi>x</mi></mrow><mn>6</mn></mfrac><mspace linebreak="newline"/><mo>⇔</mo><mn>2</mn><mi>x</mi><mo>-</mo><mn>3</mn><mo>(</mo><mn>2</mn><mi>x</mi><mo>+</mo><mn>1</mn><mo>)</mo><mo>=</mo><mi>x</mi><mo>-</mo><mn>6</mn><mi>x</mi><mspace linebreak="newline"/><mo>⇔</mo><mn>2</mn><mi>x</mi><mo>-</mo><mn>6</mn><mi>x</mi><mo>-</mo><mn>3</mn><mo>=</mo><mi>x</mi><mo>-</mo><mn>6</mn><mi>x</mi><mo>⇔</mo><mi>x</mi><mo>=</mo><mn>3</mn></math></p>
<p><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>b</mi><mo>)</mo><mo> </mo><mfrac><mrow><mn>2</mn><mo>+</mo><mi>x</mi></mrow><mn>5</mn></mfrac><mo>-</mo><mn>0</mn><mo>,</mo><mn>5</mn><mi>x</mi><mo>=</mo><mfrac><mrow><mn>1</mn><mo>-</mo><mn>2</mn><mi>x</mi></mrow><mn>4</mn></mfrac><mo>+</mo><mn>0</mn><mo>,</mo><mn>25</mn><mspace linebreak="newline"/><mo>⇔</mo><mfrac><mrow><mn>4</mn><mo>(</mo><mn>2</mn><mo>-</mo><mi>x</mi><mo>)</mo></mrow><mn>20</mn></mfrac><mo>-</mo><mfrac><mrow><mn>10</mn><mi>x</mi></mrow><mn>20</mn></mfrac><mo>=</mo><mfrac><mrow><mn>5</mn><mo>(</mo><mn>1</mn><mo>-</mo><mn>2</mn><mi>x</mi><mo>)</mo></mrow><mn>20</mn></mfrac><mo>+</mo><mfrac><mn>5</mn><mn>20</mn></mfrac><mspace linebreak="newline"/><mo>⇔</mo><mn>4</mn><mo>(</mo><mn>2</mn><mo>+</mo><mi>x</mi><mo>)</mo><mo>-</mo><mn>10</mn><mi>x</mi><mo>=</mo><mn>5</mn><mo>(</mo><mn>1</mn><mo>-</mo><mn>2</mn><mi>x</mi><mo>)</mo><mo>+</mo><mn>5</mn><mspace linebreak="newline"/><mo>⇔</mo><mn>8</mn><mo>+</mo><mn>4</mn><mi>x</mi><mo>-</mo><mn>10</mn><mi>x</mi><mo>=</mo><mn>5</mn><mo>-</mo><mn>10</mn><mi>x</mi><mo>+</mo><mn>5</mn><mspace linebreak="newline"/><mo>⇔</mo><mn>4</mn><mi>x</mi><mo>=</mo><mn>10</mn><mo>-</mo><mn>8</mn><mo>⇔</mo><mi>x</mi><mo>=</mo><mn>0</mn><mo>,</mo><mn>5</mn></math></p>
Hướng dẫn Giải Bài 18 (Trang 14, 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 14 (Trang 13 SGK Toán Đại số 8, Tập 2)</div>
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Xem lời giải
Hướng dẫn giải Bài 15 (Trang 13 SGK Toán Đại số 8, Tập 2)
Xem lời giải
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<div class="n-content-exercise">Hướng dẫn giải Bài 16 (Trang 13 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 17 (Trang 14 SGK Toán Đại số 8, Tập 2)</div>
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Xem lời giải
Hướng dẫn giải Bài 19 (Trang 14 SGK Toán Đại số 8, Tập 2)
Xem lời giải
Hướng dẫn giải Bài 20 (Trang 14 SGK Toán Đại số 8, Tập 2)
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Video hướng dẫn giải bài tập
Hướng dẫn Giải Bài 18 (Trang 14, SGK Toán 8, Tập 2, Phần Đại Số)
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