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因式分解吧, 一:分組分解法 x的平方-xy+xz-yz=x(x-y)+z(x-y)=(x+z)(x-y) 也可一三一組,二四一組 二:十字相乘法 x的平方-xy+xz-yz=x的平方-(y-z)x-yz=(x-y)(x+z)
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