[（7右13分之1加2,4）除以6右5分之2]乘以5
=[（92/13 +12/5）除以32/5] 乘以5
=（92/13 +12/5）*5/32 *5
=92/13 *25/32 +12/5*25/32
=575/104 +15/8
=(575+195)/104
=385/52