化简4(x-2y)^2-3[(x-2y)^2+2(x+y)]+2x+2y
人气:391 ℃ 时间:2020-06-09 18:20:29
解答
4(x-2y)²-3[(x-2y)²+2(x+y)]+2x+2y
=4(x-2y)²-3(x-2y)²-6(x+y)+2(x+y)
=(x-2y)²-4(x+y)
=x²+4y²-4xy-4x-4y
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