(16分之9+32分之9-8分之3）*3分之4
=9/16*4/3+9/32*4/3-3/8*4/3
=3/4+3/8-1/2
=6/8+3/8-4/8
=5/8
15分之11除7+7分之1*15分之4
=11/15*1/7+4/15*1/7
=1/7*(11/15+4/15)
=1/7*1
=1/7