x3+1怎么得到(x+1)(x2-x+1)

x3+1怎么得到(x+1)(x2-x+1) 因式分解（1+x+x2+x3)2-x3 因式分解x3-x2-x-1 计算(x3+x2+x+2)/(x2+1) y=In(x3+x)+x2+1怎么求导 化简：{(x3-1)／(x2+x+1)}+{(x3+1)／(x+1)}-{(x3-x)／(x-1)} x5-x4+x3-x2+x-1因式分解 X5-X4+X3+X2+X+1因式分解 2x3+3x2-4x-1 因式分解：x4+x3+2x2 +x+1 x3-x2+x+1如何因式分解 x3+x2-x+1分解因式 x3-x2-3x-1 化简 已知X3+X2+X+1=0,求1+X+X2+X3+X4的值 x4+2x3+x2+1+2(x+x2)因式分解 x2-x-1=0,-x3+2x2+2008= X2+x-1=0,那么x3 + X2+2008= 1+X+X2+X3=0,X+X2+X3+~+X2000=?