42-x+38-y=48-x-y

42-x+38-y=48-x-y {(x,y) |x|+|y| x>y?x:y 二元函数f(x,y)=x+y/x-y,求f(y/x,x/y) >>> x =input("x:") x:34 >>> y =input("y:") y:42 >>> print x [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)=? 4x十6y=48 3x十5y=38求x和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