题目；X＋X+X+Y+Y=45,X+X+Y+y=34那么X是多少?Y是多少?x与Y的积是多少?

题目；X＋X+X+Y+Y=45,X+X+Y+y=34那么X是多少?Y是多少?x与Y的积是多少? y=x(x x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 化简 x / y(x+y) - y / x(x+y) = 题目x+y=x*y,x.y不等于0,x,y是不同的数,求x,y {(x,y) |x|+|y| x>y?x:y x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空 x+x+x+x+y+y+y=56 x^/y-x-y^/y-x化简. 化简x(y-x)-y(x-y) 行列式计算 x y x+y y x+y x x+y x y|x y x+y ||y x+y x ||x+y x y | y/(x+y)-x/(x-y) 解方程组题目一道(x+y)(x-2y)=-5(x-y)(x+2y)=7 推倒公式:(x+y)(x*x-3x+y*y)=x*x*x+y*y*y怎么做. 因式分解x(x+y)(x-y)-x(x+y)^2 x(x+y)(x-y)-x(x+y)的平方 x(x+y)(x-y)-x(x+y)² 因式分解