分母为120最简真分数之和怎么解答:19/120,23/120,29/120,31/120,37/120 41/120,43/120,47/120,49/120,53/120 59/120,61/120,67/120,71/120,73/120 77/120,79/120,83/120,89/120,91/120 97/120,101/120,103/120,107/120,109/120 113/120,119/120 那么分母为120最简真分数之和为:1/120+7/120+11/120+13...