已知x,y满足x^2+4y^2+2x-4y+2=0,则根号(5x^2+16y^2)=?
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已知x,y满足x^2+4y^2+2x-4y+2=0,则根号(5x^2+16y^2)=?
已知x,y满足x^2+4y^2+2x-4y+2=0,则根号(5x^2+16y^2)=?
已知x,y满足x^2+4y^2+2x-4y+2=0,则根号(5x^2+16y^2)=?
x^2+4y^2+2x-4y+2=0
(x+1)^2+(2y-1)^2=0
x+1=0,2y-1=0
x=-1,y=1/2
√5x^2+16y^2=√(5*(-1))^2+16*(1/2)^2
=5+16*1/4
=5+4=9
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