帮我看看怎么因式分解2x³-5x²+1

问题描述:

帮我看看
怎么因式分解2x³-5x²+1

2x³-5x²+1
=2x³-x²-4x²+1
=2x³-x²-(4x²-1)
=x²(2x-1)-(2x+1)(2x-1)
=(2x-1)(x²-2x-1)

2x³-5x²+1=(x²-2x-1)(2x-1)

解析,
2x³-5x²+1
=2x³-x²-4x²+1
=2x³-x²-(4x²-1)
=x²(2x-1)-(2x+1)(2x-1)
=(2x-1)(x²-2x-1)

2x³-5x²+1=(x²-2x-1)(2x-1),,,,,