(x+y)^2-(x^3+y^3)除以(x+y) (x^3+y^3)除以(x+y)这部分怎么算?
【(x+2y)方-(x+y)(3x-y)-5y方】除以2x
[3(x+y)的立方-5(x+y)的平方-2x-2y]除以(x+y)
已知|3x-y|+|x+y|=0,求x-y除以x*y的值.
(x+y)除以2=(y+z)除以3=(z+y)除以4,x+y+z=27这个方程怎么解啊.
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1
先化简,再求值:[(X+2Y)平方-(X+Y)(3X-Y)-5Y平方]除以(2X)其中X=-2,Y=1/2
[x(x^2y^2-xy)-y(x^2-x^3y)]除以3x^2y
[(3x+2y)(3x-2y)-(x+2y)(5x-2y)]除以4x
[(5x+2y)(3x+2y)+(x+2y)(x-2y)]除以4x
化简:【(x-y)的2次方+(x+y)(x-y)】除以2x,其中x=3,y=1.5
(x/x+y +2y/x+y)乘以xy/ x+2y除以(1/x+1/y)(2)(3x^2/4y)^2乘以2y/3x+ x
解方程组X+Y除以2+X—Y除以3=6和4(X+Y)—5(X—Y)=2