题目内容
若|x-
| +(2y+1)2=0,则x2+y2的值是( )
| 1 |
| 2 |
| A.0 | B.
| C.
| D.1 |
根据题意得,x-
=0,2y+1=0,
解得x=
,y=-
,
∴x2+y2=(
)2+(-
)2=
+
=
.
故选B.
| 1 |
| 2 |
解得x=
| 1 |
| 2 |
| 1 |
| 2 |
∴x2+y2=(
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 4 |
| 1 |
| 4 |
| 1 |
| 2 |
故选B.
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