1,2,3,2,3,4,3,4,5,4,5,6,5,6,7.从第一个数算起,前100个数的和是多少?

Question

1,2,3,2,3,4,3,4,5,4,5,6,5,6,7.从第一个数算起,前100个数的和是多少?

Answer 1

100÷3=33………1
1 2 3
2 3 4
3 4 5
4 5 6
………
33 34 35
34………
前100个数的和=（1+2+3+…+33）+（2+3+4+…+34）+(3+4+5+…+35)+34
=561+594+627+34
=1816