8分之5-4分之1×9分之8÷3分之2
=5/8-2/9×3/2
=5/8-1/3
=7/24
5分之4+15分之4-5分之2
=12/15+4/15-6/15
=10/15
=2/3
7分之6×8分之5+8分之3÷6分之7
=6/7×5/8+3/8×6/7
=6/7×(5/8+3/8)
=6/7×1
=6/7
8分之5-4分之1×9分之8÷3分之2
=5/8-2/9×3/2
=5/8-1/3
=7/24
5分之4+15分之4-5分之2
=12/15+4/15-6/15
=10/15
=2/3
7分之6×8分之5+8分之3÷6分之7
=6/7×5/8+3/8×6/7
=6/7×(5/8+3/8)
=6/7×1
=6/7