求102+104+106+108+····+1002的和,急求,谢谢

问题描述:

求102+104+106+108+····+1002的和,急求,谢谢

248952

102+104+106+108+····+1002
=(102+1002)×(1002/2-100/2)÷2
=1104×451/2
=248952