помогите 15 баллов

(3,5 − 11/3) : 2/13

(3,5 - 11/3 ) : 2/13 =  - 1_1/12

       1          2

1) 3,5 - 11/3 = 3_1/2 - 3_2/3 = 3_3/6 - 3_4/6 = -1/6

2) -1/6 : 2/13 = -1/6 * 13/2 = - 13/12 = -1_1/12