2+5+8+11+14+······98+101 从2到101总共(101-2)÷3+1=34 则两两凑成1对,共有34÷2=17对 则 2+5+8+11+14+······98+101
=(2+101)+(5+99)+.(50+53)
=17x103
=901
2+5+8+11+14+······98+101 从2到101总共(101-2)÷3+1=34 则两两凑成1对,共有34÷2=17对 则 2+5+8+11+14+······98+101
=(2+101)+(5+99)+.(50+53)
=17x103
=901