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化简(x-2y)平方-(2x-y)(-2x-y)+(x-5y)(x+2y)
人气:468 ℃ 时间:2019-10-19 18:11:32
解答
(x-2y)²-(2x-y)(-2x-y)+(x-5y)(x+2y)
=x²+4y²-4xy-y²+4x²+2xy-5xy-10y²=6x²-7y²-7xy
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