题目内容
解方程:(1) x2+4x-4=0
(2)5(x-2)2=3(2-x)
(2)5(x-2)2=3(2-x)
(1)x2+4x=4
x2+4x+4=8
(x+2)2=8
x+2=±2
x=-2±2
∴x1=-2+2
,x2=-2-2
.
(2)5(x-2)2-3(2-x)=0
(x-2)(5x-10+3)=0
(x-2)(5x-7)=0
∴x1=2,x2=
.
x2+4x+4=8
(x+2)2=8
x+2=±2
| 2 |
x=-2±2
| 2 |
∴x1=-2+2
| 2 |
| 2 |
(2)5(x-2)2-3(2-x)=0
(x-2)(5x-10+3)=0
(x-2)(5x-7)=0
∴x1=2,x2=
| 7 |
| 5 |
练习册系列答案
相关题目