(2x-1)(x+2)-(2x+1)²+2x(x-8),其中x=-1

来源：学生作业帮助网编辑：作业帮时间：2024/05/10 11:09:48

(2x-1)(x+2)-(2x+1)²+2x(x-8),其中x=-1
(2x-1)(x+2)-(2x+1)²+2x(x-8),其中x=-1

(2x-1)(x+2)-(2x+1)²+2x(x-8),其中x=-1
(2x-1)(x+2)-(2x+1)²+2x(x-8),
=2x²-x+4x -2 -4x²-4x-1+2x²-16x
= -17x -3
其中x=-1
= 17 -3
=14

(2x-1)(x+2)-(2x+1)²+2x(x-8)
=2x-1-1-2(x-8)
=2x-2-2x+16
=14

(2x-1)(x+2)-(2x+1)²+2x(x-8)
=2x²+3x-2-4x²-4x-1+2x²-16x
=-17x-3
=17-3
=14