14-13,2:(3 11/21- 2 4/15)

14 - 13,2 : (3 11/21 - 2 4/15) = 3,51) 3 11/21 - 2 4/15 = 3 55/105 - 2 28/105 = 1 27/105 = 1 9/352) 13,2 : 1 9/35 = 132/10 : 44/35 = 132/10 * 35/44 = 3/10 * 35 = 105/10 = 10,53) 14 - 10,5 = 3,5