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已知,M(x+y)(x-y)={2XY-Y^2/(x+y)(x-y)}+1,则M=
人气:289 ℃ 时间:2020-05-25 21:57:08
解答
M(x+y)(x-y)={2XY-Y²/(x+y)(x-y)}+1
=[2XY-Y²+x²-y²]/[(x+y)(x-y)],
M=[x²+2xy-2y²]/[(x+y)²(x-y)²],
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