5x+4y=44 且(5x+y)=(4y+x) 求x y各是多少?

已知：4x = 5y,求(x+y) ：y 已知5x-4y=0且xy不等于0,求x^2+y^2/x^2-y^2-x+y/x-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* 若x^5+x^4y+x^4+x+y+1=0,且3x+2y=1,求x,y的值 已知x=1/3,y=-1/2,求代数式x-(x+y)+(x+2y)-(x+3y)+(x+4y)-(x+5y)+...-( 已知x²+y²+5=2x+4y,求【2x²-(x-y)(x-y)】【(x+y-1)(x-y 已知3x-2y-5z=0,2x-5y+4z=0,且x,y,z均不为0,求3x*x+2y*y+5z*z/5x*x+y*y- 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 已知x^2+4y^2-4x+4y+5=0,求(y^4-x^4)/(y-2x)(x+y)*2x-y 已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值 已知：x*x+√3y=√5,y*y+√3x=√5,且x≠y,求 y/x+x/y 如果x,y表示有理数,且x、y满足条件,|x|=5,|y|=2.|x-y|=y-x,求：x+2y的值.