已知2/y-5/x=16,5/y+6/x=13,求x、y.

已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 已知：4x = 5y,求(x+y) ：y 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x.x+y.y-6x-8y+25=0,求3x.x+5y的值 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 (1)已知x+y=6,x²-y²=5,求x-y的值（2）若x+y=3,x²+y² 已知实数x,y满足根号2x-y的值+5x-6=y-根号y-2x,求x,y的值 已知x^3+xy^2+x+x^2y+y^3+y=0,求5x-6y/3x+4y的值. 已知x+y=-5,x*x+y*y=19求xy和（x-y)*(x-y)的值 已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y