1. 17,5 : 2 1/2 =

1. 17,5 : 2 1/2 =

= 175/10 : 5/2

= 175/10 × 2/5

= 350/50 = 7

2. 12 1/2 : 0,5 =

= 25/2 : 5/10

= 25/2 × 10/5

= 250/10

= 25

3. 1,25 : 4 1/2 =

= 125/100 : 9/2

= 125/100 × 2/9

= 250/900

= 18/5

4. 3 3/4 : 1,2 =

= 15/4 : 12/10

= 15/4 × 10/12

= 150/48 = 25/8

5. 5 1/5 : 2,24 =

= 26/5 : 224/100

= 26/5 × 100/224

= 2600/1120 = 65/28