(4X+1)(4X-1)-(2X-5)(2X+3)计算
问题描述:
(4X+1)(4X-1)-(2X-5)(2X+3)计算
答
=16x²-1-(4x²-4x-15)
=16x²-1-4x²+4x+15
=12x²-4x+14