19.94-19.91+19.88-19.85+19.82-……+1.04-1.01简便计算
问题描述:
19.94-19.91+19.88-19.85+19.82-……+1.04-1.01简便计算
答
19.94-19.91+19.88-19.85+19.82-……+1.04-1.01
=(19.94-19.91)+(19.88-19.85)+(19.82-19.79)……+(1.04-1.01)
=0.03*[(19.94-1.04)÷0.06+1]
=0.03*316
=9.48