1 and 1 / 4 + 2 and 1 / 28 + 3 and 1 / 70 + 4 and 1 / 130 + 5 and 1 / 208

1:1 + 2:28 + 3:70 + 4:130 + 5:208 = 1 + 2 + 3 + 4 + 5 + 1 / 4 + 1 / 28 + 1 / 70 + 1 / 130 + 1 / 208 = 15 + 1 / 1x4 + 1 / 4x7 + 1 / 7x10 + 1 / 10x13 + 1 / 13X16 = 15 + 1 / 3 (1-1 / 4 + 1 / 7-1 / 7 + 1 / 7-1 / 7 + 1 / 7-1 / 10 + 1 / 10-1 / 13 + 1 / 13-1 / 16) = 15 + 1 / 3x (1-1 / 16

14+128+170+1130+1208=______ ．

14+128+170+1130+1208，=（1-14+14-17+17-110+110-113+113-116）×13，=（1-116）×13，=1516×13，=516．

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