问题
解答题
已知2x2+2xy+y2-2x+1=0,求
|
答案
∵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
+1 2x+y
=1 x-y
+1 2-1
=1 1+1
.3 2
已知2x2+2xy+y2-2x+1=0,求
|
∵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
+1 2x+y
=1 x-y
+1 2-1
=1 1+1
.3 2