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把多项式x^2-x+y-y^2因式分解,结果为
人气:245 ℃ 时间:2020-06-15 04:57:23
解答
x^2-x+y-y^2
= x²- y² - (x-y)
= (x+y)(x-y) - (x-y)
= (x+y-1 )( x-y)
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