2,85-(7/15:1 13/15+5/8)=
1) 7/15 : 1 13/15 = 7/15 х 15/28 = 1/4 2) 1/4 + 5/8 = 2+5/8 = 7/8 = 0,875 3) 2,85 + 0,875 = 3,725