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化简再求值:6X^2-(2X-1)(3X-2)+(X+2)(X-2),其中X=2
人气：153 ℃　时间：2020-03-27 09:21:24
解答
6X^2-(2X-1)(3X-2)+(X+2)(X-2)
=6x^2-6x^2+7x-2+x^2-4
=x^2+7x-6
=4+14-6
=12
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