（1）67个
1,2,3,4,7,8,9,11,13,14,16,17,19,21,22,23,26,27,28,29,31,32,33,34,37,38,39,41,43,44,46,47,49,51,52,53,56,57,58,59,61,62,63,64,67,68,69,71,73,74,76,77,78,79,81,82,83,86,87,88,89,91,92,93,94,97,98,99
5,6的倍数有6,12,18,24,30,36,42,48,54,60,66,72,78,84,90,96,5,10,15,20,25,35,40,45,50,55,65,70,75,80,85,95,100
（2）1/4+1/4=1/2
1/6+1/6=3/1
1/8+1/8=1/4