(2x-1)(x-3)-(x-1)²

问题描述:

(2x-1)(x-3)-(x-1)²

(2x-1)(x-3)-(x-1)²=2x²-6x-x+3-(x²-2x+1)=2x²-7x+3-x²+2x-1=x²-5x+2