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(x+y)的平方乘以(x-y)-(x-y)乘以(x的平方+y的平方)
人气:461 ℃ 时间:2020-05-26 13:25:05
解答
=(x-y)[(x+y)²-(x²+y²)]
=(x-y)(x²+2xy+y²-x²-y²)
=2xy(x-y)
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