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(2X-Y)²-4(X-Y)*(X+Y)-(X-Y)*(X-1)
人气:365 ℃ 时间:2020-04-01 10:40:14
解答
(2X-Y)²-4(X-Y)*(X+Y)-(X-Y)*(X-1)
=4x²-4xy+y²-4x²+4y²-x²+xy-y+x
=-x²-4xy+5y²+xy-y+x
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