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(x+y)^4-2(x+y)^2-8 因式分解
人气:200 ℃ 时间:2020-03-27 14:04:04
解答
(x+y)^4-2(x+y)^2-8
=[(x+y)²-4][(x+y)²+2]
=(x+y+2)(x+y-2)(x²+2xy+y²+2)
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