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-(x-y)^2-2(y-x)^2-5(x-y)^2+8(x-y)^2化简
人气:422 ℃ 时间:2020-07-11 19:10:10
解答
(y-x)²
=[-1*(x-y)]²
=(-1)²*(x-y)²
=1*(x-y)²
=(x-y)²
所以原式=(-1-2-5+8)(x-y)²
=0
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