x+2y+2=0 7x-4y=-41 求x和y

{x+2y+2=0 {7y-4y=-41 求X和Y x+2y+2=0 7x-4y=-41 求x和y x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 x*x+2x+y*y-4y+5=0 x= y= 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*y)的值 (x-y)(x-2y)+(x-2y)(x-7y),其中X=4,Y=1.5 已知x*x+4x+y*y-2y+5=0,则x*x+y*y=? (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= 已知|5x-y-8|+(7y-x+2)=0则4x+6y (x-4y)(2x+y)= 7y(x-3y)-2(3y-x)=0 .x=?,y=? 已知7x+5y/2y-x=3/2,且x≠0,求X/x-4y 若2x-3y+4=0则x（x*x-1)+x(5-x*x)-6y+7 已知(3x+1)(3x-3)-3x+2)^2=-7,(y+7)(y-7)-y(y-7)=0,求8y^2-5y(-y+3x)+4y(-4y-5/2x)的值 y-3x=2,y-5x=4,y-7x=6,y-9x=8,y-11x=0方程组,无 x*x+y*y-2x+4y+5=0求x, 已知x^2+y^2+13-4x+6y=0,求(2x-y)^2-2(2x-y)(x+2y)+(x+2y)^2