把2x³-5x²+1因式分解

问题描述:

把2x³-5x²+1因式分解

(2x-1)(x²-2x-1)

原式=2x³-4x²-2x-x²+2x+1
=2x(x²-2x-1)-(x²-2x-1)
=(2x-1)(x²-2x-1)