1) 3 7/25 + 2,72 = 3,28 + 2,72 = 6
2)6*5/24 = 5/4
3) 15/16 : 3 3/4 = 15/16 : 15/4 = 15/16*6/15 = 1/4
4)1/4 - 2/9 = 9/36 - 8/36 = 1/36
5) 5/4:1/36 = 5/4*36/1 = 45
6)0,224:0,35 = 0,64
7)0,36 + 0,64 = 1
8) 5,85 : 1 19/20 = 5,85 : 1,95 =3
9)3 - 2 5/9 = 4/9
10)4/9 : 4 = 4/9 * 1/4 = 1/9
11)1 : 1/9 = 9
12) 45 - 9 =36