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(2x-1)^2-(4x+3)(x-6)
人气:375 ℃ 时间:2020-06-03 04:23:04
解答
(2x-1)^2-(4x+3)(x-6)
=4x²-4x+1-(4x²-24x+3x-18)
=4x²-4x+1-4x²+21x+18
=17x+19
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