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Trang chủ / Giải bài tập / Lớp 8 / Toán học / Bài 3: Phương Trình Đưa Được Về Dạng ax + b = 0
Bài 3: Phương Trình Đưa Được Về Dạng ax + b = 0
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class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise">Hướng dẫn giải Bài 10 (Trang 12 SGK Toán Đại số 8, Tập 2)</div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> 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<p>Tìm ch&ocirc;̃ sai và sửa lại các bài giải sau cho đúng</p> <p><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>a</mi><mo>)</mo><mo>&#160;</mo><mn>3</mn><mi>x</mi><mo>-</mo><mn>6</mn><mo>+</mo><mi>x</mi><mo>=</mo><mn>9</mn><mo>-</mo><mi>x</mi><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mi>b</mi><mo>)</mo><mo>&#160;</mo><mn>2</mn><mi>t</mi><mo>-</mo><mn>3</mn><mo>+</mo><mn>5</mn><mi>t</mi><mo>=</mo><mn>4</mn><mi>t</mi><mo>+</mo><mn>12</mn><mspace linebreak="newline"/><mo>&#8660;</mo><mn>3</mn><mi>x</mi><mo>+</mo><mi>x</mi><mo>-</mo><mi>x</mi><mo>=</mo><mn>9</mn><mo>-</mo><mn>6</mn><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#8660;</mo><mo>&#160;</mo><mn>2</mn><mi>t</mi><mo>+</mo><mn>5</mn><mi>t</mi><mo>-</mo><mn>4</mn><mi>t</mi><mo>=</mo><mn>12</mn><mo>-</mo><mn>3</mn><mspace linebreak="newline"/><mo>&#8660;</mo><mn>3</mn><mi>x</mi><mo>=</mo><mn>3</mn><mo>&#8660;</mo><mi>x</mi><mo>=</mo><mn>1</mn><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#160;</mo><mo>&#8660;</mo><mn>3</mn><mi>t</mi><mo>=</mo><mn>9</mn><mo>&#8660;</mo><mi>t</mi><mo>=</mo><mn>3</mn></math></p> <p><strong>Giải</strong></p> <p>a) Vi&ecirc;́t&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mn>3</mn><mi>x</mi><mo>-</mo><mn>6</mn><mo>+</mo><mi>x</mi><mo>=</mo><mn>9</mn><mo>-</mo><mi>x</mi><mo>&#8660;</mo><mn>3</mn><mi>x</mi><mo>+</mo><mi>x</mi><mo>-</mo><mi>x</mi><mo>=</mo><mn>9</mn><mo>-</mo><mn>6</mn></math> là sai, vì&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mo>-</mo><mn>6</mn></math> chuy&ecirc;̉n v&ecirc;́ từ trái sang phải và -x từ v&ecirc;́ phải sang v&ecirc;́ trái</p> <p>mà kh&ocirc;ng đ&ocirc;̉i d&acirc;́u của các hạng tử này. C&acirc;̀n làm như sau:</p> <p><math xmlns="http://www.w3.org/1998/Math/MathML"><mn>3</mn><mi>x</mi><mo>-</mo><mn>6</mn><mo>+</mo><mi>x</mi><mo>=</mo><mn>9</mn><mo>-</mo><mi>x</mi><mo>&#8660;</mo><mn>3</mn><mi>x</mi><mo>+</mo><mi>x</mi><mo>+</mo><mi>x</mi><mo>=</mo><mn>9</mn><mo>+</mo><mn>6</mn><mo>&#8660;</mo><mn>5</mn><mi>x</mi><mo>=</mo><mn>15</mn><mo>&#8660;</mo><mi>x</mi><mo>=</mo><mn>15</mn><mo>:</mo><mn>5</mn><mo>=</mo><mn>3</mn></math></p> <p>b) Vi&ecirc;́t <math xmlns="http://www.w3.org/1998/Math/MathML"><mn>2</mn><mi>t</mi><mo>-</mo><mn>3</mn><mo>+</mo><mn>5</mn><mi>t</mi><mo>=</mo><mn>4</mn><mi>t</mi><mo>+</mo><mn>12</mn><mo>&#8660;</mo><mn>2</mn><mi>t</mi><mo>+</mo><mn>5</mn><mi>t</mi><mo>-</mo><mn>4</mn><mi>t</mi><mo>=</mo><mn>12</mn><mo>-</mo><mn>3</mn></math>, sai ở ch&ocirc;̃ chuy&ecirc;̉n -3 từ v&ecirc;́ trái sang v&ecirc;́ phải mà kh&ocirc;ng đ&ocirc;̉i d&acirc;́u của</p> <p>s&ocirc;́ hạng đó. C&acirc;̀n làm như sau:</p> <p><math xmlns="http://www.w3.org/1998/Math/MathML"><mn>2</mn><mi>t</mi><mo>-</mo><mn>3</mn><mo>+</mo><mn>5</mn><mi>t</mi><mo>=</mo><mn>4</mn><mi>t</mi><mo>+</mo><mn>12</mn><mo>&#8660;</mo><mn>2</mn><mi>t</mi><mo>+</mo><mn>5</mn><mi>t</mi><mo>-</mo><mn>4</mn><mi>t</mi><mo>=</mo><mn>12</mn><mo>+</mo><mn>3</mn><mo>&#8660;</mo><mn>3</mn><mi>t</mi><mo>=</mo><mn>15</mn><mo>&#8660;</mo><mi>t</mi><mo>=</mo><mn>5</mn></math></p>
Hướng dẫn Giải Bài 10 (Trang 12, SGK Toán 8, Tập 2, Phần Đại Số)
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Hướng dẫn giải Bài 11 (Trang 13 SGK Toán Đại số 8, Tập 2)
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Hướng dẫn giải Bài 12 (Trang 13 SGK Toán Đại số 8, Tập 2)
Xem lời giải
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class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise">Hướng dẫn giải Bài 13 (Trang 13 SGK Toán Đại số 8, Tập 2)</div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> 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</div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div>
Xem lời giải
Video hướng dẫn giải bài tập
Hướng dẫn Giải Bài 10 (Trang 12, SGK Toán 8, Tập 2, Phần Đại Số)
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