Решите пожалуйста: 3/14+5/21 и 7/8-4/10

Question

Решите пожалуйста: 3/14+5/21 и 7/8-4/10

Answer 1

3/14 + 5/21 = 9+10/42=19/42
7/8 - 4/10= 35-16/40=19/40

Answer 2

3/15 + 5/21 = 9+10/42 = 19/42
7/8 - 4/10 = 35-16/40 = 19/40