化简再求值:6X^2-(2X-1)(3X-2)+(X+2)(X-2),其中X=2

分类: 作业答案 • 2021-12-28 14:22:41

问题描述：

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