14÷3分之7÷0.5
=14*3/7÷0.5
=6÷0.5
=12
4分之3×18＋17分之12÷5分之6
=3/4X18+12/17X5/6
=27/2+10/17
=209/14
13分之15÷25分之5÷6分之7
=15/13X5X6/7
=150/91