(1) (2x-1)³=-64(2) 3(x+2)²=27

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/02 10:57:33
(1) (2x-1)³=-64(2) 3(x+2)²=27

(1) (2x-1)³=-64(2) 3(x+2)²=27
(1) (2x-1)³=-64
(2) 3(x+2)²=27

(1) (2x-1)³=-64(2) 3(x+2)²=27

(2x-1)³=-64
(2x-1)³=-4³
开立方根
2x-1=-4
∴2x=-3
∴x=-3/2
3(x+2)²=27
(x+2)²=9
开方
x+2=3或x+2=-3
∴x=1或x=-5

(2x-1)³=-64
2x-1=4
2x=5
x=5/2
3(x+2)²=27
(x+2)²=9
x+2=3 x+2=-3
x=1 x=-5