Question

помогите 1/2+1/5 1/2-1/5 2/7+2/5 2/5-2/7 1-2/7

Answer 1

Ответ:

1. 1/2 + 1/5 = (5/10) + (2/10) = 7/10

2. 1/2 - 1/5 = (5/10) - (2/10) = 3/10

3. 2/7 + 2/5 = (10/35) + (14/35) = 24/35

4. 2/5 - 2/7 = (14/35) - (10/35) = 4/35

5. 1 - 2/7 = (7/7) - (2/7) = 5/7