3x^2(x-y)+12(y-x)化简
化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方
化简(x+y)-(2x+y/2)-(3x+y/6)-(4x+y/12)-(5x+y/20)-……-(10x+y/90)
化简:{2/3x-2/(x+y)[(x+y)/3x-x-y]}/【(x-y)/x】的负二次方
化简(x-3y)(3x+y)-(2x-3y)(2x-3y)
(2x+3y)(3x-2y)-(x-2y)(x+2y)化简
化简:[(x+2y)^2-(x+y)(3x-y)-5y^2]/2x
有这样一道题:"计算(2*x*x*x-3*x*x*y-2*x*y*y)-(x*x*x-2*x*y*y+y*y*y)+【-
化简:3x(2x+y)-2x(x-y) x是字母x不是乘号
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
[(3x+y)(x-y)-(2x+3y)(x-y)]*(x-y)
【x-3y][x+y]-[x-2y][x +2y]-[x-y
化简[(3x+4y)^2-(2x+y)(2x-y)+(-x+y)(5x-y)]除以-2y,其中x=-1,y=1