(1)(x^2+y)(-y+x^2)-(-x)^2·(-x^2) (2)(5x-3)(5x+3)-3x(3x-7) 怎么
(1)(x^2+y)(-y+x^2)-(-x)^2·(-x^2) (2)(5x-3)(5x+3)-3x(3x-7) 怎么
y=(x-1)(x-2)(x-3)(x-4)(x-5)(x-6)(x-7)(x-8)(x-9)(x-10)的导数在x=1
若2x-3y+4=0则x(x*x-1)+x(5-x*x)-6y+7
先化简再求值(x-y)(x+y)-(x-2y) 的完全平方+x(3x-5y)-(x-y)(x-2y),其中x=1/2 y
数学(x-y)^5*(y-x)^3*(x-y)^2
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
7x+[-3x-3(x-2y)]-[5x-(2x-y)]
(2X-3y)-(5x-y)
(x+2)(x+3) (x-4)(x+1) (y+4)(y-2) (y-5)(y-3)
[(x+2y)(x-2y)-(2x-y)^2+(3x-y))2x-5y)]/(-x)
因式分解3x^2(x-y)+6x(y-x)
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)+【-