已知x y满足x^2+y^2-4x+y+17/4=0求（x+y)^2的值
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已知xy满足x^2+y^2-4x+y+17/4=0求（x+y)^2的值已知xy满足x^2+y^2-4x+y+17/4=0求（x+y)^2的值已知xy满足x^2+y^2-4x+y+17/4=0求（x+y
已知x y满足x^2+y^2-4x+y+17/4=0求（x+y)^2的值
已知x y满足x^2+y^2-4x+y+17/4=0
求（x+y)^2的值
已知x y满足x^2+y^2-4x+y+17/4=0求（x+y)^2的值
x^2+y^2-4x+y+17/4=0
x^2-4x+4+y^2+y+1/4=0
(x-2)^2+(y+1/2)^2=0
x-2=0,x=2
y+1/2=0,y=-1/2
(x+y)^2=(2-1/2)^2=9/4