Ответ:
⅔ : 7/9 = ⅔ · 9/7 = 2 · 3/7 = 6/7 ;
6 : 3/5 = 6 · 5/3 = 2 · 5 = 10 ;
4 ½ : 3 ¾ = 9/2 : 15/4 = 9/2 · 4/15 = 3 · 2/5 = 6/5 = 1 1/5 ;
20/21 : 15 = 20/21 · 1/15 = 4/21 · ⅓ = 4/63.
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Ответ:
⅔ : 7/9 = ⅔ · 9/7 = 2 · 3/7 = 6/7 ;
6 : 3/5 = 6 · 5/3 = 2 · 5 = 10 ;
4 ½ : 3 ¾ = 9/2 : 15/4 = 9/2 · 4/15 = 3 · 2/5 = 6/5 = 1 1/5 ;
20/21 : 15 = 20/21 · 1/15 = 4/21 · ⅓ = 4/63.