分母是105的最简真分数有多少个那就是分子是1-104,且不是5,3,7的倍数,
那么分母是105,而分子是
1,2,4,8, (4个)
11,13,16,17,19, (5个)
22,23,26,29, (4个)
31,32,34,37,38, (5个)
41,43,44,46,47, (5个)
52,53,58,59, (4个)
61,62,64,67,68, (5个)
71,73,74,76,79, (5个)
82,83,86,88,89, (5个)
92,94,97, (3个)
101,103,104, (3个)
4+5+4+5+5+4+5+5+5+3+3=48个
分母是105的最简真分数有48个
这些分子相加,和是2520
2520/105=24
它们的和是24