15/16÷(7/16-1/4)÷1/3
=15/16÷3/16÷1/3
=15/16×16/3×3
=15
2-6/13÷9/26-2/3
=2-6/13×26/9-2/3
=2-4/3-2/3
=2-(4/3+2/3)
=2-2
=0
(8.6-3/5)÷16/21
=8÷16/21
=8×21/16
=21/2
=10.5
15/16÷(7/16-1/4)÷1/3
=15/16÷3/16÷1/3
=15/16×16/3×3
=15
2-6/13÷9/26-2/3
=2-6/13×26/9-2/3
=2-4/3-2/3
=2-(4/3+2/3)
=2-2
=0
(8.6-3/5)÷16/21
=8÷16/21
=8×21/16
=21/2
=10.5