계산: 13 + 16 + 110 + 115 + 121 + 128 + 136 + 145 =...

계산: 13 + 16 + 110 + 115 + 121 + 128 + 136 + 145 =...

13 + 16 + 110 + 115 + 121 + 128 + 136 + 145, = 22 × 3 + 23 × 4 + 24 × 5 +...+ 29 × 10, = 2 [(12 − 13) + (13 − 14) + (14 − 15) +...+ (19 − 110), = 2 (12 − 110), = 45; 그러므로 정 답: 45.