化简:(2x-1)²-(3x+1)×(3x-1)-5x(1-x)=
人气:122 ℃ 时间:2019-08-30 13:04:22
解答
(2x-1)²-(3x+1)×(3x-1)-5x(1-x)
=4x²-4x+1-9x²+1-5x+5x²
=-9x+2
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