x2+y2=19.36 x：y=:16:10 求x和y各自的值

已知x-y+1,X2+Y2=25 求（x+y）2和x2-xy+y2的值 已知x2+y2-10x-6y+34=0,求y\x+y的值 若X2+Y2-2X-6Y+10=0 ,求（x2-y2)/xy的值 已知2x=3y,求xy／(x2+y2)-y2／(x2-y2)的值 正整数x,y满足x2-y2=2xy,求x-y/x+y的值 整数x,y满足x2-y2=2xy,求x-y/x+y的值 已知：x2+2x+y2-6y+10=0，求x，y的值． 已知：x2+y2-10x-2y+26=0，求x、y的值． 已知x2+y2+2x-6y+10=0，求x+y的值． 若x2-2x+y2+6y+10=0,求x,y的值 已知x2-2x+y2+6y+10=0,求（2x-y)的值 已知[(x2+y2)-(x-y)2+2y(x-y)]÷4y=1,求4x/4x2-4y2-1/2x+y的值,