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化简y(x+y)+(x+y)(x-y)-x^2
人气:484 ℃ 时间:2020-06-07 11:04:09
解答
y(x+y)+(x+y)(x-y)-x^2
=(x+y)(y+x-y)-x^2
=(x+y)*x-x^2
=xy
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