y-x=458(0.85y-x)=12(y-35-x)
y-x=458(0.85y-x)=12(y-35-x)
(x*x+y*y)(x*x+y*y)-(x*x+y*y)=12 求x*x+y*y等于多少
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
已知实数x,y满足|x|+x+y=10、x+|y|-y=12,则x+y的值?
X.Y为自然数,X(X-Y)-Y(Y-X)=12,求X.Y的值
x,y都是自然数,且x(x-y)-y(y-x)=12,求x+y-xy的值
Y-X=45 (85%Y-X)×8=(Y-35-X)×12
Y-X=45 (80%Y-X)×8=(Y-35-X)×12
) 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)=?