计算:-3a+2a-5a 5(2a-1)

问题描述:

计算:-3a+2a-5a 5(2a-1)

888888wy你好!
计算:-3a+2a-5a 5(2a-1)
=-a-25a(2a-1)
=-a-50a^2+25a
=24a-50a^2