化简求值3(a-2)(a+3)-5(a-3)(a-5)
问题描述:
化简求值3(a-2)(a+3)-5(a-3)(a-5)
答
3(a-2)(a+3)-5(a-3)(a-5)
=3(a^2+3a-2a-6)-5(a^2-5a-3a+15)
=3a^2+3a-18-5a^2+40a-75
=-2a^2+43a-93