x-y=8 45/x=36/y x=?y=?

x+x+x+y=52 y+y+y+x=36求x 【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2= 二元函数f(x,y)=x+y/x-y,求f(y/x,x/y) [x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013 ) y=cos(x-y) x+y=5; x^y+y^x=17 因式分解下列式子：x(x-y)+y(y-x)=? （x+2y)(x-2y)-(2y-x)(-2x-y)其中x=8,y=-8 解下X+X+X+Y=52 Y+Y+Y+X＝36 求X＝? Y＝?还要过程 [(x+2y)(x-2y)-(x-2y)^2+8y(x+y)]除以4x= 根据x+x+x+y+y=54,x+x+y+y+y=56,求出x.y的值 已知X-Y/X+Y=3,求代数式2(x-y)/X+Y-3X+Y/X+Y