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分解因式(x+y)方+4(x-y)方-4(x方-y方)
人气:432 ℃ 时间:2020-04-14 03:56:34
解答
(x+y)方+4(x-y)方-4(x方-y方)
=[(x+y)²-(2x-2y)²]²
=[(x+y+2x-2y)(x+y-2x+2y)]²
=(3x-y)²(3y-x)²
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