1)
2x³+x-3
=（2x³-2)+(x-1)
=2(x³-1)+(x-1)
=2(x-1)(x²+x+1)+(x-1) 立方差公式
=(x-1)(2x²+2x+2+1)
=(x-1)(2x²+2x+3)
2）貌似已经是质因式了