x+x+x+y=52 y+y+y+x=36求x
x+x+x+y=52 y+y+y+x=36求x
解下X+X+X+Y=52 Y+Y+Y+X=36 求X=? Y=?还要过程
二元函数f(x,y)=x+y/x-y,求f(y/x,x/y)
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)
求y'=y/(y-x)
(x*x+y*y)(x*x+y*y)-(x*x+y*y)=12 求x*x+y*y等于多少
{(x,y) |x|+|y|
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|x-y |=x-y |x |=1999 |y |2000,求x+y的值
已知/x/+x+y=10,/y/+x-y=12.求x+y的值
若x-y=1,求代数式x(x-y)+y(y-x)+2013的值