乘法公式的几道题!化简:(-x-1)(x^2-x+1)的结果是( )a.-x^3+1 b.-x^3-1 c.x^3+1 d.x^3-1 (a^2-a+1)(a^2+a+1)(a^4-a^2+1)(x^2-y^2)(x+y)-2xy(x-y)(x+y)(a+b+c)^2-(b+c)^2-(c+2)^2-(a+b)^2(x^5-x^2)(x^10+x^7+x^4)

问题描述:

乘法公式的几道题!
化简:
(-x-1)(x^2-x+1)的结果是( )
a.-x^3+1 b.-x^3-1 c.x^3+1 d.x^3-1
(a^2-a+1)(a^2+a+1)(a^4-a^2+1)
(x^2-y^2)(x+y)-2xy(x-y)(x+y)
(a+b+c)^2-(b+c)^2-(c+2)^2-(a+b)^2
(x^5-x^2)(x^10+x^7+x^4)