tolong jawab no 13 14 pliss pakai cara desimal

13) 2 8/10:8,4×4 8/10-1,3+5 1/6=
= 28/10:8,4×48/10-1,3+31/5
= (2,8:8,4×4,8)-(1,3+6,2)
= 1,6-7,5= -5,9

14) 4 2/5+3,75:(3,5-1 5/6)= 22/5+3,75:(3,5-11/6)
=4,4+3,75:(1,8)
=8,15÷1,8=4,5