题目内容
解方程:
(1)x(x-2)=x
(2)x2-x-1=0(用配方法)
(1)x(x-2)=x
(2)x2-x-1=0(用配方法)
(1)x(x-2)-x=0,
x(x-2-1)=0,
∴x1=0,x2=3;
(2)x2-x=1,
x2-x+(-
)2=1+
,
(x-
)2=
,
x-
=±
,
∴x1=
,x2=
.
x(x-2-1)=0,
∴x1=0,x2=3;
(2)x2-x=1,
x2-x+(-
| 1 |
| 2 |
| 1 |
| 4 |
(x-
| 1 |
| 2 |
| 5 |
| 4 |
x-
| 1 |
| 2 |
| ||
| 2 |
∴x1=
1+
| ||
| 2 |
1-
| ||
| 2 |
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