(2x-3)(x+1)-(2x-1)(-2x-1)计算

问题描述:

(2x-3)(x+1)-(2x-1)(-2x-1)计算

=(2x-3)(x+1) + (2x-1)(2x+1)
=(2x²-x-3)+(4x²-1)
=6x²-x-4