题目内容
已知
=
,则
的值为( )
| x |
| y |
| 2 |
| 3 |
| x+y |
| x |
| A.5 | B.-5 | C.
| D.-
|
∵
=
,
∴y=
x,
∴
=
=
.
故选C.
| x |
| y |
| 2 |
| 3 |
∴y=
| 3 |
| 2 |
∴
| x+y |
| x |
x+
| ||
| x |
| 5 |
| 2 |
故选C.
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题目内容
| x |
| y |
| 2 |
| 3 |
| x+y |
| x |
| A.5 | B.-5 | C.
| D.-
|
| x |
| y |
| 2 |
| 3 |
| 3 |
| 2 |
| x+y |
| x |
x+
| ||
| x |
| 5 |
| 2 |