题目内容
已知2x2+2xy+y2-2x+1=0,求
+
的值.
| 1 |
| 2x+y |
| 1 |
| x-y |
∵2x2+2xy+y2-2x+1=(x+y)2+(x-1)2=0,
∴x+y=0,x-1=0,
解得:x=1,y=-1,
则
+
=
+
=
.
∴x+y=0,x-1=0,
解得:x=1,y=-1,
则
| 1 |
| 2x+y |
| 1 |
| x-y |
| 1 |
| 2-1 |
| 1 |
| 1+1 |
| 3 |
| 2 |
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