(3-1целая 7/15)*5+(2-1целая5/16)*4 по действиям

(3 - 1 7/15) * 5 + (2 - 1 5/16) * 4 = 10 5/12
1) 3 - 1 7/15 = 2 15/15 - 1 7/15 = 1 8/15
2) 2 - 1 5/16 = 1 16/16 - 1 5/16 = 11/16
3) 1 8/15 * 5 = 23/15 * 5 = 23/3 = 7 2/3
4) 11/16 * 4 = 11/4 = 2 3/4
5) 7 2/3 + 2 3/4 = 7 8/12 + 2 9/12 = 9 17/12 = 10 5/12 

(3 - 1 7/15)*5 + (2 - 1 5/16)*4 = (45/15 - 22/15)*5 + (32/15 - 21/16)*4 =
23/15*5 + 11/16*4 = 23/3 + 11/4 = 92/12 + 33/12 = 125/12 = 10 5/12