Bài 3: Phương Trình Đưa Được Về Dạng ax + b = 0
Hướng dẫn giải Bài 11 (Trang 13 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><mn>3</mn><mi>x</mi><mo>-</mo><mn>2</mn><mo>=</mo><mn>2</mn><mi>x</mi><mo>-</mo><mn>3</mn><mspace linebreak="newline"/><mi>b</mi><mo>)</mo><mo> </mo><mn>3</mn><mo>-</mo><mn>4</mn><mi>u</mi><mo>+</mo><mn>24</mn><mo>+</mo><mn>6</mn><mi>u</mi><mo>=</mo><mi>u</mi><mo>+</mo><mn>27</mn><mo>+</mo><mn>3</mn><mi>u</mi><mspace linebreak="newline"/><mi>c</mi><mo>)</mo><mo> </mo><mn>5</mn><mo>-</mo><mo>(</mo><mi>x</mi><mo>-</mo><mn>6</mn><mo>)</mo><mo>=</mo><mn>4</mn><mo>(</mo><mn>3</mn><mo>-</mo><mn>2</mn><mi>x</mi><mo>)</mo><mspace linebreak="newline"/><mi>d</mi><mo>)</mo><mo> </mo><mo>-</mo><mn>6</mn><mo>(</mo><mn>1</mn><mo>,</mo><mn>5</mn><mo>-</mo><mn>2</mn><mi>x</mi><mo>)</mo><mo>=</mo><mn>3</mn><mo>(</mo><mo>-</mo><mn>15</mn><mo>+</mo><mn>2</mn><mi>x</mi><mo>)</mo><mspace linebreak="newline"/><mi>e</mi><mo>)</mo><mo> </mo><mn>0</mn><mo>,</mo><mn>1</mn><mo>-</mo><mn>2</mn><mo>(</mo><mn>0</mn><mo>,</mo><mn>5</mn><mi>t</mi><mo>-</mo><mn>0</mn><mo>,</mo><mn>1</mn><mo>)</mo><mo>=</mo><mn>2</mn><mo>(</mo><mi>t</mi><mo>-</mo><mn>2</mn><mo>,</mo><mn>5</mn><mo>)</mo><mo>-</mo><mn>0</mn><mo>,</mo><mn>7</mn><mspace linebreak="newline"/><mi>f</mi><mo>)</mo><mo> </mo><mfrac><mn>3</mn><mn>2</mn></mfrac><mo>(</mo><mi>x</mi><mo>-</mo><mfrac><mn>5</mn><mn>4</mn></mfrac><mo>)</mo><mo>-</mo><mfrac><mn>5</mn><mn>8</mn></mfrac><mo>=</mo><mi>x</mi><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><mn>3</mn><mi>x</mi><mo>-</mo><mn>2</mn><mo>=</mo><mn>2</mn><mi>x</mi><mo>-</mo><mn>3</mn><mo>⇔</mo><mn>3</mn><mi>x</mi><mo>-</mo><mn>2</mn><mi>x</mi><mo>=</mo><mo>-</mo><mn>3</mn><mo>+</mo><mn>2</mn><mo>⇔</mo><mi>x</mi><mo>=</mo><mo>-</mo><mn>1</mn><mspace linebreak="newline"/><mspace linebreak="newline"/><mi>b</mi><mo>)</mo><mo> </mo><mn>3</mn><mo>-</mo><mn>4</mn><mi>u</mi><mo>+</mo><mn>24</mn><mo>+</mo><mn>6</mn><mi>u</mi><mo>=</mo><mi>u</mi><mo>+</mo><mn>27</mn><mo>+</mo><mn>3</mn><mi>u</mi><mo>⇔</mo><mn>2</mn><mi>u</mi><mo>+</mo><mn>27</mn><mo>=</mo><mn>4</mn><mi>u</mi><mo>+</mo><mn>27</mn><mspace linebreak="newline"/><mo>⇔</mo><mn>2</mn><mi>u</mi><mo>-</mo><mn>4</mn><mi>u</mi><mo>=</mo><mn>27</mn><mo>-</mo><mn>27</mn><mo>⇔</mo><mo>-</mo><mn>2</mn><mi>u</mi><mo>=</mo><mn>0</mn><mo>⇔</mo><mi>u</mi><mo>=</mo><mn>0</mn><mspace linebreak="newline"/><mspace linebreak="newline"/><mi>c</mi><mo>)</mo><mo> </mo><mn>5</mn><mo>-</mo><mo>(</mo><mi>x</mi><mo>-</mo><mn>6</mn><mo>)</mo><mo>=</mo><mn>4</mn><mo>(</mo><mn>3</mn><mo>-</mo><mn>2</mn><mi>x</mi><mo>)</mo><mo>⇔</mo><mn>5</mn><mo>-</mo><mi>x</mi><mo>+</mo><mn>6</mn><mo>=</mo><mn>12</mn><mo>-</mo><mn>8</mn><mi>x</mi><mspace linebreak="newline"/><mo>⇔</mo><mn>8</mn><mi>x</mi><mo>-</mo><mi>x</mi><mo>=</mo><mn>12</mn><mo>-</mo><mn>6</mn><mo>-</mo><mn>5</mn><mo>⇔</mo><mn>7</mn><mi>x</mi><mo>=</mo><mn>1</mn><mo>⇔</mo><mi>x</mi><mo>=</mo><mfrac><mn>1</mn><mn>7</mn></mfrac><mspace linebreak="newline"/><mspace linebreak="newline"/><mi>d</mi><mo>)</mo><mo> </mo><mo>-</mo><mn>6</mn><mo>(</mo><mn>1</mn><mo>,</mo><mn>5</mn><mo>-</mo><mn>2</mn><mi>x</mi><mo>)</mo><mo>=</mo><mn>3</mn><mo>(</mo><mo>-</mo><mn>15</mn><mo>+</mo><mn>2</mn><mi>x</mi><mo>)</mo><mo>⇔</mo><mo>-</mo><mn>9</mn><mo>+</mo><mn>12</mn><mi>x</mi><mo>=</mo><mo>-</mo><mn>45</mn><mo>+</mo><mn>6</mn><mi>x</mi><mspace linebreak="newline"/><mo>⇔</mo><mn>12</mn><mi>x</mi><mo>-</mo><mn>6</mn><mi>x</mi><mo>=</mo><mo>-</mo><mn>45</mn><mo>+</mo><mn>9</mn><mo>⇔</mo><mn>6</mn><mi>x</mi><mo>=</mo><mo>-</mo><mn>36</mn><mo>⇔</mo><mi>x</mi><mo>=</mo><mo>-</mo><mn>6</mn><mspace linebreak="newline"/><mspace linebreak="newline"/><mi>e</mi><mo>)</mo><mo> </mo><mn>0</mn><mo>,</mo><mn>1</mn><mo>-</mo><mn>2</mn><mo>(</mo><mn>0</mn><mo>,</mo><mn>5</mn><mi>t</mi><mo>-</mo><mn>0</mn><mo>,</mo><mn>1</mn><mo>)</mo><mo>=</mo><mn>2</mn><mo>(</mo><mi>t</mi><mo>-</mo><mn>2</mn><mo>,</mo><mn>5</mn><mo>)</mo><mo>-</mo><mn>0</mn><mo>,</mo><mn>7</mn><mspace linebreak="newline"/><mo>⇔</mo><mn>0</mn><mo>,</mo><mn>1</mn><mo>-</mo><mi>t</mi><mo>+</mo><mn>0</mn><mo>,</mo><mn>2</mn><mo>=</mo><mn>2</mn><mi>t</mi><mo>-</mo><mn>5</mn><mo>-</mo><mn>0</mn><mo>,</mo><mn>7</mn><mo>⇔</mo><mo>-</mo><mi>t</mi><mo>-</mo><mn>2</mn><mi>t</mi><mo>=</mo><mo>-</mo><mn>5</mn><mo>,</mo><mn>7</mn><mo>-</mo><mn>0</mn><mo>,</mo><mn>3</mn><mspace linebreak="newline"/><mo>⇔</mo><mi>t</mi><mo>=</mo><mn>2</mn><mspace linebreak="newline"/><mspace linebreak="newline"/><mi>f</mi><mo>)</mo><mo> </mo><mfrac><mn>3</mn><mn>2</mn></mfrac><mo>(</mo><mi>x</mi><mo>-</mo><mfrac><mn>5</mn><mn>4</mn></mfrac><mo>)</mo><mo>-</mo><mfrac><mn>5</mn><mn>8</mn></mfrac><mo>=</mo><mi>x</mi><mo>⇔</mo><mfrac><mn>3</mn><mn>2</mn></mfrac><mi>x</mi><mo>-</mo><mfrac><mn>15</mn><mn>8</mn></mfrac><mo>-</mo><mfrac><mn>5</mn><mn>8</mn></mfrac><mo>=</mo><mi>x</mi><mo>⇔</mo><mfrac><mrow><mn>4</mn><mo>.</mo><mn>3</mn><mi>x</mi></mrow><mn>8</mn></mfrac><mo>-</mo><mfrac><mn>20</mn><mn>8</mn></mfrac><mo>=</mo><mfrac><mrow><mn>8</mn><mi>x</mi></mrow><mn>8</mn></mfrac><mspace linebreak="newline"/><mo>⇔</mo><mn>12</mn><mi>x</mi><mo>-</mo><mn>8</mn><mi>x</mi><mo>=</mo><mn>20</mn><mo>⇔</mo><mi>x</mi><mo>=</mo><mn>5</mn></math></p>
Hướng dẫn Giải Bài 11 (Trang 13, 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 10 (Trang 12 SGK Toán Đại số 8, Tập 2)</div>
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Xem lời giải
Hướng dẫn giải Bài 12 (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 13 (Trang 13 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 11 (Trang 13, SGK Toán 8, Tập 2, Phần Đại Số)
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