题目内容
方程2x2-
=0的解是( )
| 1 |
| 2 |
| A.x1=x2=2 | B.x1=x2=
| ||||
| C.x1=2,x2=-2 | D.x1=
|
移项得:2x2=
,
x2=
,
x1=
,x2=-
,
故选D.
| 1 |
| 2 |
x2=
| 1 |
| 4 |
x1=
| 1 |
| 2 |
| 1 |
| 2 |
故选D.
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题目内容
| 1 |
| 2 |
| A.x1=x2=2 | B.x1=x2=
| ||||
| C.x1=2,x2=-2 | D.x1=
|
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 2 |
| 1 |
| 2 |