计算题:(过程要清晰) (1)(3x-4)(x-2)-(x+5)(x-3) (2)(a²+3)(a-2)-a(a²-2a-2)
问题描述:
计算题:(过程要清晰) (1)(3x-4)(x-2)-(x+5)(x-3) (2)(a²+3)(a-2)-a(a²-2a-2)
答
1)原式=3x^2-10x+8-x^2+2x+15
=2x^2-8x+23
2)原式=a^3+3a-2a^2-6-a^3+2a^2+2a
=5a-6