比1/2大,比7小,分母是6的最简真分数有几个?比1/2大,比7小,分母是12的最简真分数的和是?

第一个问题有5/6,6/7,11/6,13/6,17/6,19/6,23/6,29/6,31/6,35/6,37/6,41/6共有12个,第二个问题为7/12+11/12+13/12+15/12+17/12+19/12+23/11+25/12+29/12+31/12+35/12+37/12+41/12+43/12+47/12+49/12+53/12+55/12+57/...