题目内容
用适当方法解方程:
(1)x2-x=1
(2)2(2x-3)2-3(2x-3)=0
(3)3x2-2
x+2=0
(1)x2-x=1
(2)2(2x-3)2-3(2x-3)=0
(3)3x2-2
| 6 |
(1) x2-x=1,
x2-x-1=0,
x=
=
,
∴x1=
,x2=
.
(2) 2(2x-3)2-3(2x-3)=0,
(2x-3)(4x-6-3)=0,
(2x-3)(4x-9)=0,
∴x1=
,x2=
.
(3) 3x2-2
x+2=0,
x=
=
,
∴x1=x2=
.
x2-x-1=0,
x=
-(-1)±
| ||
| 2×1 |
1±
| ||
| 2 |
∴x1=
1+
| ||
| 2 |
1-
| ||
| 2 |
(2) 2(2x-3)2-3(2x-3)=0,
(2x-3)(4x-6-3)=0,
(2x-3)(4x-9)=0,
∴x1=
| 3 |
| 2 |
| 9 |
| 4 |
(3) 3x2-2
| 6 |
x=
2
| ||||
| 2×3 |
| ||
| 3 |
∴x1=x2=
| ||
| 3 |
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