2 8/10÷8,4×4 8/10-1,3+5 1/6

2 8/10 ÷ 8,4 × 4 8/10 - 1,3 + 5 1/6
= 28/10 ÷ 84/10 × 48/10 - 13/10 + 31/6
= 14/5 ÷ 42/5 × 24/5 - 13/10 + 31/6
= 14/5 × 5/42 × 24/5 - 13/10 + 31/6
= 1.680/1.050 - 13/10 + 31/6
= 8/5 - 13/10 + 31/6
= 48/30 - 39/30 + 155/30
= 164/30
= 5 14/30
= 5 7/15

Semoga bisa membantu...