4/9×3/4÷2/5
=1/3÷2/5
=5/6
13分之6+9分之5+13分之7+9分之4
=6/13+7/13+5/9+4/9
=1+1
=2
2分之1×[(4分之3-8分之1)÷16分之15]
=1/2×[(8分之6-8分之1)×16/15]
=1/2×[5/8×16/15]
=1/2× 2/3
=1/3
5分之13×7分之6+5分之13÷7
=5分之13×6/7+5分之13×1/7
=5分之13×1/7×(6+1)
=5分之13×1/7×7
=13/5
=2又3/5
120÷[56×(7分之3-8分之3)]
=120÷[56×7分之3-56×8分之3]
=120÷[24-21]
=120÷3
=40
6分之1÷[1÷(5分之3-10分之3)]
=6分之1÷[1÷(10分之6-10分之3)]
=6分之1÷[1÷10分之3]
=1/6÷3/10
=1/20