题目内容
解下列方程:
(1)(x-1)(x-3)=-1
(2)2x2+5x-3=0
(3)2x2-6=
x
(1)(x-1)(x-3)=-1
(2)2x2+5x-3=0
(3)2x2-6=
| 2 |
(1)整理得:x2-4x+3+1=0,
(x-2)2=0,
∴x1=x2=2;
(2)(x+3)(2x-1)=0,
∴2x-1=0或x+3=0,
∴x1=
,x2=-3;
(3)整理得:2x2-
x-6=0,
(
x-3)(
x+2)=0,
∴(
x-3)=0,(
x+2)=0,
∴x1=
,x2=-
.
(x-2)2=0,
∴x1=x2=2;
(2)(x+3)(2x-1)=0,
∴2x-1=0或x+3=0,
∴x1=
| 1 |
| 2 |
(3)整理得:2x2-
| 2 |
(
| 2 |
| 2 |
∴(
| 2 |
| 2 |
∴x1=
| 3 |
| 2 |
| 2 |
| 2 |
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