Question

помогите срочно нужно

Answer 1

8/10+3/7 = 56/70 + 30/70 = 86/70 = 1 16/70 = 1 8/35
3 1/3 - 2 5/10 = 10/3 - 22/10 = 100/30 - 66/30 = 34/30 = 17/15 = 1 2/15
4 9/10 + 1 1/9 = 49/10 -10/9 = 441/90 - 100/90 = 341/90 = 3 71/90