1+3+6+9……+360这个规律怎么算?

2025-04-14 03:54:30
推荐回答(1个)
回答1:

1+3+6+9……+360
=1+(3+360)X[(360-3)÷3+1]÷2
=1+363X120÷2
=1+360X60
=1+21600
=21601