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化简(x减y)乘(x加y)加(x减y)加(x加y)等于多少?
人气:282 ℃ 时间:2020-07-17 21:27:51
解答
=(x-y)×(x+y)+x
=(x-y+1)×x+(x-y)×y
= x×x- y×x + x + y×x - y×y
=x×x + x - y×y
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