请大家帮忙我答

2024-12-12 19:18:16
推荐回答(1个)
回答1:

(x-1)(2x-1)-(x+1)²+1
=2x²-x-2x+1-(x²+2x+1)+1
=2x²-3x+1-x²-2x-1+1
=x²-5x+1
∵x²-5x=14
∴原式=14+1=15