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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"> <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 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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<p>Bạn Hòa giải phương trình:&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>x</mi><mo>(</mo><mi>x</mi><mo>+</mo><mn>2</mn><mo>)</mo><mo>=</mo><mi>x</mi><mo>(</mo><mi>x</mi><mo>+</mo><mn>3</mn><mo>)</mo></math> như sau:</p> <p><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>x</mi><mo>(</mo><mi>x</mi><mo>+</mo><mn>2</mn><mo>)</mo><mo>=</mo><mi>x</mi><mo>(</mo><mi>x</mi><mo>+</mo><mn>3</mn><mo>)</mo><mspace linebreak="newline"/><mo>&#8660;</mo><mi>x</mi><mo>+</mo><mn>2</mn><mo>=</mo><mi>x</mi><mo>+</mo><mn>3</mn><mspace linebreak="newline"/><mo>&#8660;</mo><mi>x</mi><mo>-</mo><mi>x</mi><mo>=</mo><mn>3</mn><mo>-</mo><mn>2</mn><mspace linebreak="newline"/><mo>&#8660;</mo><mn>0</mn><mi>x</mi><mo>=</mo><mn>1</mn><mo>&#160;</mo><mo>(</mo><mi>v</mi><mi>o</mi><mo>&#160;</mo><mi>n</mi><mi>g</mi><mi>h</mi><mi>i</mi><mi>e</mi><mi>m</mi><mo>)</mo></math></p> <p>Theo em, bạn Hòa giải đúng hay sai?</p> <p>Em sẽ giải phương trình đó như th&ecirc;́ nào?</p> <p><strong>Giải</strong></p> <p>Bạn Hòa đã vi&ecirc;́t:&nbsp;<math xmlns="http://www.w3.org/1998/Math/MathML"><mi>x</mi><mo>(</mo><mi>x</mi><mo>+</mo><mn>2</mn><mo>)</mo><mo>=</mo><mi>x</mi><mo>(</mo><mi>x</mi><mo>+</mo><mn>3</mn><mo>)</mo><mo>&#8660;</mo><mi>x</mi><mo>+</mo><mn>2</mn><mo>=</mo><mi>x</mi><mo>+</mo><mn>3</mn></math></p> <p>Vì bạn đã chia hai v&ecirc;́ của phương trình thứ nh&acirc;́t cho x. Đi&ecirc;̀u này kh&ocirc;ng đúng vì bi&ecirc;́n s&ocirc;́ x có th&ecirc;̉ nh&acirc;̣n giá trị 0.</p> <p>Ta chỉ nh&acirc;̣n được m&ocirc;̣t phương trình mới tương đương n&ecirc;́u chia hai v&ecirc;́ của m&ocirc;̣t phương trình cho m&ocirc;̣t s&ocirc;́ khác 0.</p> <p>Ta giải như sau:</p> <p><math xmlns="http://www.w3.org/1998/Math/MathML"><mi>x</mi><mo>(</mo><mi>x</mi><mo>+</mo><mn>2</mn><mo>)</mo><mo>=</mo><mi>x</mi><mo>(</mo><mi>x</mi><mo>+</mo><mn>3</mn><mo>)</mo><mo>&#8660;</mo><msup><mi>x</mi><mn>2</mn></msup><mo>+</mo><mn>2</mn><mi>x</mi><mo>=</mo><msup><mi>x</mi><mn>2</mn></msup><mo>+</mo><mn>3</mn><mi>x</mi><mspace linebreak="newline"/><mo>&#8660;</mo><msup><mi>x</mi><mn>2</mn></msup><mo>-</mo><msup><mi>x</mi><mn>2</mn></msup><mo>+</mo><mn>2</mn><mi>x</mi><mo>-</mo><mn>3</mn><mi>x</mi><mo>=</mo><mn>0</mn><mo>&#8660;</mo><mo>-</mo><mi>x</mi><mo>=</mo><mn>0</mn><mo>&#8660;</mo><mi>x</mi><mo>=</mo><mn>0</mn></math></p>
Hướng dẫn Giải Bài 13 (Trang 13, SGK Toán 8, Tập 2, Phần Đại Số)
GV: GV colearn
Xem lời giải bài tập khác cùng bài
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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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</div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </div> </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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