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化简(x平方-y平方)/(x+y)+(x平方-2xy+y平方)/(x-y)
人气:455 ℃ 时间:2020-01-28 13:57:24
解答
(x平方-y平方)/(x+y)+(x平方-2xy+y平方)/(x-y)
=(x+y)(x-y)/(x+y)+(x-y)^2/(x-y)
=x-y+x-y
=2(x-y)
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