(X+65)÷8=Y Y+40=X X=?Y=?
[x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013
【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+y)(x+2y)(x+3y)(x+4y)=-40
2x-y=2,求[(x²+y²)-(x-y)²+2y(x-y)]÷4y
) 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
[(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