因式分解 (x-1)(x-2)-2(2-x)的平方
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因式分解 (x-1)(x-2)-2(2-x)的平方
![因式分解 (x-1)(x-2)-2(2-x)的平方](/uploads/image/z/11717666-26-6.jpg?t=%E5%9B%A0%E5%BC%8F%E5%88%86%E8%A7%A3+%28x-1%29%28x-2%29-2%282-x%29%E7%9A%84%E5%B9%B3%E6%96%B9)
(x-1)(x-2)-2(2-x)^2
= (x-1)(x-2)-2(x-2)^2
= (x-2) { (x-1) - 2(x-2) }
= (x-2) { x-1 - 2x+4 }
= (x-2)(-x+3)
= - (x-2)(x-3)
= (x-1)(x-2)-2(x-2)^2
= (x-2) { (x-1) - 2(x-2) }
= (x-2) { x-1 - 2x+4 }
= (x-2)(-x+3)
= - (x-2)(x-3)