1÷25%
=1÷0.25
=4
8分之3-37.5%
=0.375-0.375
=0
3又5分之2÷3
=5分之17×3分之1
=15分之17
=1又15分之2
4-1又5分之1÷1又5分之1
=4-1
=3
19÷19%
=19÷0.19
=100