题目内容
解方程:
(1)(2x-1)2=3-6x;(2)用配方法解方程2x2+x-6=0
(1)(2x-1)2=3-6x;(2)用配方法解方程2x2+x-6=0
(1)(2x-1)2=3-6x,
整理得(2x-1)2+3(2x-1)=0,
即:(2x-1)(2x+2)=0,
∴2x-1=0,2x+2=0,
解得x1=0.5,x2=-1;
(2)∵2x2+x-6=0,
∴2x2+x=6,
∴2(x2+
x+
)=6+
,
∴2(x+
)2=
,
(x+
)2=
,
x+
=±
,
∴x1=-2,x2=
.
整理得(2x-1)2+3(2x-1)=0,
即:(2x-1)(2x+2)=0,
∴2x-1=0,2x+2=0,
解得x1=0.5,x2=-1;
(2)∵2x2+x-6=0,
∴2x2+x=6,
∴2(x2+
| 1 |
| 2 |
| 1 |
| 16 |
| 1 |
| 8 |
∴2(x+
| 1 |
| 4 |
| 49 |
| 8 |
(x+
| 1 |
| 4 |
| 49 |
| 16 |
x+
| 1 |
| 4 |
| 7 |
| 4 |
∴x1=-2,x2=
| 3 |
| 2 |
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