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