已知x、y满足x^2+4y^2+2x-4y+2=0,则根号下5x^2+16y^2=
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![已知x、y满足x^2+4y^2+2x-4y+2=0,则根号下5x^2+16y^2=](/uploads/image/z/1743263-71-3.jpg?t=%E5%B7%B2%E7%9F%A5x%E3%80%81y%E6%BB%A1%E8%B6%B3x%5E2%2B4y%5E2%2B2x-4y%2B2%3D0%2C%E5%88%99%E6%A0%B9%E5%8F%B7%E4%B8%8B5x%5E2%2B16y%5E2%3D)
已知x、y满足x^2+4y^2+2x-4y+2=0,则根号下5x^2+16y^2=
已知x、y满足x^2+4y^2+2x-4y+2=0,则根号下5x^2+16y^2=
已知x、y满足x^2+4y^2+2x-4y+2=0,则根号下5x^2+16y^2=
x^2+4y^2+2x-4y+2=0
x^2+2x+1+4y^2-4y+1=0
(x+1)^2+(2y+1)^2=0
x=-1 y=-1/2
5x^2+16y^2=5*(-1)^2+16*(-1/2)^2=5+4=9