Помогите надо решить 2) 4)

Question

Помогите надо решить 2) 4)

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Answer 1

1) 2 2/5 : 12 = 12/5  * 1/12 = 1/5;
2) 2 2/5 : 8 = 12/5 * 1/8 = 3/10;
3) 2 2/5 : 3 2/5 = 12/5 : 17/5 = 12/5 * 5/17 = 12/17;
4) 2 2/5 : 4 3/7 = 12/5 : 31/7 = 12/5 * 7/31 = 84/155.