1/100+2/100+3/100·······98/100+99/100怎样算?
问题描述:
1/100+2/100+3/100·······98/100+99/100怎样算?
答
1/100+2/100+3/100·······98/100+99/100
=(1+2+3+……98+99)/100
=(1+99)x99/(2x100)
=49.5