решение по действиям:

1)3 7/25 + 2,72 = 82/25 + 2 72/100 =  82/25 + 2 18/25 = 82/25 + 68/25 = 150/25 = 6

2) 6 * 5/24 = 6/1 * 5/24 = 30/24 = 5/4

3) 15/16: 3 3/4 = 15/16 : 15/4 = 15*4 / 16*15 = 1/4

4) 1/4 - 2/9 = 9/36 - 8/36 = 1/36

5) 5/4 : 1/36 = 5*36 / 4* 1 = 45

6) 0,224 : 0,35 = 224/1000 : 35/100= 224/350 = 32/70

7) 0,36 + 32/70= 36/100+32/70 = 18/50 + 32/70 = 126/350 + 160/350 = 186/350

8) 186/350 * 5/1 = 186/70 

9) 5,85 : 1 19/20 = 5 85/100 : 39/20 = 5 17/20 : 39/20 = 117/20 : 39/20 = 117*20/20*39 = 3

10) 3 - 2 5/9 = 2 9/9 - 2 5/9 = 4/9

11) 4/9 :4= 1/9

12) 186/70 : 1/9 =  1674/70

13) 186/70 : 1674/70 = 186*70 / 70 * 1674 = 1/9

14) 45 - 1/9 = 44 9/9 - 1/9 = 44 8/9