(2x+7)×(3x-4)+(3x+5)×(3x-2)计算
问题描述:
(2x+7)×(3x-4)+(3x+5)×(3x-2)计算
答
(6x^2+13x-28)+(9x^2+9x-10)
=15x^2+21x-38