(3x²-2)(x+4)-(x²-3)(3x-5)怎么解
问题描述：
(3x²-2)(x+4)-(x²-3)(3x-5)怎么解
答
(3x²-2)(x+4)-(x²-3)(3x-5)
=3x³+12x²-2x-8-(3x³-5x²-9x+15)
=3x³+12x²-2x-8-3x³+5x²+9x-15
=17x²+7x-23