x-y+(37/12)=3 1.1=0.8y+0.75x 该方程组怎么解?x=?y=?

x-y+(37/12)=3 1.1=0.8y+0.75x 该方程组怎么解?x=?y=? 12y(x-y)^2-8(x-y)^3=? 3x+y=2 -y/x+y=123x+y=2 （-y/x）+y=12 设x.y满足条件y>=0.X-Y+1>=0.x+y-3 （x+y-5)*（x+y-5)+（x-y+3)=0 x*x-y*y 已知:3x-5y=0,求x/y,x-y/y,x-y/x 3y=2x y/3=x/2 12/x=9/y y/x=?y/x=?x/y=? 21/(x+y)+4/(x-y)=12/(x+y)+7/(x-y)结果为(x+y)/(x-y)=3求过程! 已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y除以2x-y 已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y/2x-y的值 已知2x-y/x+3y=2,求代数式4x-2y/x+3y减4x+12y/2x-y的值 推倒公式:(x+y)(x*x-3x+y*y)=x*x*x+y*y*y怎么做. 3x-7y=-24 x+y=12 (x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一 解方程组 {8x+7y=37 7x+8y=38} {x+3y=3分之1 3x-2y=12} (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 化简 x-y/(y-x)^3=