(x^3-2x^y)÷(-x^2)
[(x+2y)^2 -(x+y)(3x-y)-5y^2]÷2x
计算:(x-y)^7÷(y-x)^6+(-x-y)^3÷(x+y)^2
[(2x+y)(x-3y)+y(x+3y)]÷(2x)计算,
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)+【-
因式分解3x^2(x-y)+6x(y-x)
[x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
急![(3x+y)²-3(3x-y)(x+y)-(x-3y)(x+3y)]÷(2xy)
化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方
【x-3y][x+y]-[x-2y][x +2y]-[x-y
[(3x+y)(x-y)-(2x+3y)(x-y)]*(x-y)
1、x(x-y)(x+y)-x(x+y)^2