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(2x-1)(x-3)-2(3x-2)(x-3)
人气:241 ℃ 时间:2020-06-24 17:29:23
解答
(2x-1)(x-3)-2(3x-2)(x-3)
=(2x2-6x-x+3)-2(3x2-9x-2x+6)
=2x2-7x+3-6x2+22x-12
=-4x2+15x-9.
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