Y+X+X=36 Y-X-X=8 X=?Y=?
x+x+x+y=52 y+y+y+x=36求x
[x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013
二元函数f(x,y)=x+y/x-y,求f(y/x,x/y)
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
x+y=5; x^y+y^x=17
因式分解下列式子:x(x-y)+y(y-x)=?
y=(lnX)/x-x
(lim) x/x-y=
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
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
f(x,y,z,w)=x*(x+y)*(x+y+z)*(x+y+z+w)