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Trang chủ / Giải bài tập / Lớp 8 / Toán học / Bài 2: Phương Trình Bậc Nhất Một Ẩn Và Cách Giải
Bài 2: Phương Trình Bậc Nhất Một Ẩn Và Cách Giải
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class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise"> <div class="n-content-exercise">Hướng dẫn giải Bài 8 (Trang 10 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> </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> 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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> </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>
<p>Giải các phương trình&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>a</mi><mo>.</mo><mo>&#160;</mo><mn>4</mn><mi>x</mi><mo>-</mo><mn>20</mn><mo>=</mo><mn>0</mn><mspace linebreak="newline"/><mi>b</mi><mo>.</mo><mo>&#160;</mo><mn>2</mn><mi>x</mi><mo>+</mo><mi>x</mi><mo>+</mo><mn>12</mn><mo>=</mo><mn>0</mn><mspace linebreak="newline"/><mi>c</mi><mo>.</mo><mo>&#160;</mo><mi>x</mi><mo>-</mo><mn>5</mn><mo>=</mo><mn>3</mn><mo>-</mo><mi>x</mi><mspace linebreak="newline"/><mi>d</mi><mo>.</mo><mo>&#160;</mo><mn>7</mn><mo>-</mo><mn>3</mn><mi>x</mi><mo>=</mo><mn>9</mn><mo>-</mo><mi>x</mi></math></p> <p><strong>Giải</strong></p> <p>Áp dụng quy tắc chuy&ecirc;̉n v&ecirc;́ và quy tắc nh&acirc;n ta được:</p> <p><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>a</mi><mo>)</mo><mo>&#160;</mo><mn>4</mn><mi>x</mi><mo>-</mo><mn>20</mn><mo>=</mo><mn>0</mn><mo>&#8660;</mo><mn>4</mn><mi>x</mi><mo>=</mo><mn>20</mn><mo>&#8660;</mo><mi>x</mi><mo>=</mo><mn>20</mn><mo>:</mo><mn>4</mn><mo>&#8660;</mo><mi>S</mi><mo>=</mo><mo>{</mo><mn>5</mn><mo>}</mo></math></p> <p><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>b</mi><mo>)</mo><mo>&#160;</mo><mn>2</mn><mi>x</mi><mo>+</mo><mi>x</mi><mo>+</mo><mn>12</mn><mo>=</mo><mn>0</mn><mo>&#8660;</mo><mn>3</mn><mi>x</mi><mo>=</mo><mo>-</mo><mn>12</mn><mo>&#8660;</mo><mi>x</mi><mo>=</mo><mo>-</mo><mn>12</mn><mo>:</mo><mn>3</mn><mo>&#8660;</mo><mi>S</mi><mo>=</mo><mo>{</mo><mo>-</mo><mn>4</mn><mo>}</mo></math></p> <p><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>c</mi><mo>)</mo><mo>&#160;</mo><mi>x</mi><mo>-</mo><mn>5</mn><mo>=</mo><mn>3</mn><mo>-</mo><mi>x</mi><mo>&#8660;</mo><mi>x</mi><mo>+</mo><mi>x</mi><mo>=</mo><mn>3</mn><mo>+</mo><mn>5</mn><mo>&#8660;</mo><mi>x</mi><mo>=</mo><mn>8</mn><mo>:</mo><mn>2</mn><mo>&#8660;</mo><mi>S</mi><mo>=</mo><mo>{</mo><mn>4</mn><mo>}</mo><mspace linebreak="newline"/><mi>d</mi><mo>)</mo><mo>&#160;</mo><mn>7</mn><mo>-</mo><mn>3</mn><mi>x</mi><mo>=</mo><mn>9</mn><mo>-</mo><mi>x</mi><mo>&#8660;</mo><mi>x</mi><mo>-</mo><mn>3</mn><mi>x</mi><mo>=</mo><mn>9</mn><mo>-</mo><mn>7</mn><mo>&#8660;</mo><mi>x</mi><mo>=</mo><mn>2</mn><mo>:</mo><mo>(</mo><mo>-</mo><mn>2</mn><mo>)</mo><mo>&#8660;</mo><mi>S</mi><mo>=</mo><mo>{</mo><mo>-</mo><mn>1</mn><mo>}</mo></math></p>
Hướng dẫn Giải Bài 8 (Trang 10, SGK Toán 8, Tập 2, Phần Đại Số)
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Hướng dẫn giải Bài 6 (Trang 9 SGK Toán Đại số 8, Tập 2)
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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"> <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 7 (Trang 10 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> </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> </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> </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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Hướng dẫn giải Bài 9 (Trang 10 SGK Toán Đại số 8, Tập 2)
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Hướng dẫn Giải Bài 8 (Trang 10, SGK Toán 8, Tập 2, Phần Đại Số)
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