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(x+y)乘以x平方-y平方分之x平方+x-y分之y平方-x平方-2xy+y平方分之2x平方y-2xy平方
人气:361 ℃ 时间:2020-04-05 16:30:15
解答
原式=(x+y)*x²/(x-y)(x+y)+y²/(x-y)-2xy(x-y)/(x-y)²
=(x²+y²)/(x-y)-2xy/(x-y)
=(x-y)²/(x-y)
=x-y
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