14-1,3:(3 11/21-2 4/15)= 14-1,3:44/35 = 14-1,3*35/44 = 14 -1 3/10*35/44 =
= 14-1 3/88 = 12 85/88
1) 3 11/21-2 4/15 = 74/21 - 34/15 = 370/105 - 238/105 = 132/105 = 44/35
2) 1,3:44/35 = 1,3*35/44 = 1 3/10*35/44 = 13/10*35/44 = 91/88 = 1 3/88
3) 14-1 3/88 = 13 88/88-1 3/88 = 12 85/88