1. 3 ½ : 0,75 2. 5% : 1 ¼ 3. 15% : 1 ²/5 4. 8/25 : 2,5 5. 2,1 :⅝

1. 3 1/2 : 3/4
= 7/2 : 3/4
= 7/2 x 4/3
= 28/6 = 14/3 = 4,67
2. 5% : 1 1/4
=5/100 : 5/4
= 1/20 x 4/5
= 4/100 = 1/25 = 0,04
3. 15% : 1 2/5
= 15/100 : 7/5
= 3/20 x 5/7
= 3/28
4. 8/25 : 2,5
= 8/25 : 5/2
= 8/25 x 2/5
= 16/125
5. 2,1 : 5/8
= 21/10 x 8/5
= 84/25
Maaf kalau salah, terima kasih...