Question

Помогите пожалуйста

Answer 1

1) 21/20 - 7/30 = 63/ 60 - 14/60 = 49/60.

2) 5/7 * 49/60 = 7/12

3) 16/21 : 8/7 = 16/21 * 7/8 = 2/3

4) 7/12 + 2/3 = 7/12 + 8/12 = 15/12