题目内容
已知a=
,b=2-
,则a,b的关系为( )
| 1 | ||
|
| 3 |
| A.a=b | B.a+b=0 | C.ab=1 | D.ab=-1 |
∵a=
=
=2-
,b=2-
,
∴a=b.
故选:A.
| 1 | ||
|
| ||||
(
|
| 3 |
| 3 |
∴a=b.
故选:A.
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题目内容
| 1 | ||
|
| 3 |
| A.a=b | B.a+b=0 | C.ab=1 | D.ab=-1 |
| 1 | ||
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(
|
| 3 |
| 3 |