Выполните действия
№641

Ответ:

1. 3/5 × 4/9 + 1 1/3= 1/5 × 4/3 + 1 1/3 = 4/15 + 1 5/15 = 1 9/15

2. 1 1/4 × 2/5 - 1/3 = 1/2 × 1/1 - 1/3 = 1/2 - 1/3 = 3/6 - 2/6 = 1/6

3. 3/8 : 1/2 + 3 1/4 = 3/4 × 1/1 + 3 1/4 = 3/4 + 3 1/4 = 3 4/4

4. 5/6 : 1/3 + 1 3/8 = 5/1 × 3/1 + 1 3/8 = 16 3/8

5. 1 2/5 : 5/7 + 3/8 = 1/1 + 3/8 = 11/8

6. 2 1/3 : 1 5/9 - 5/6 = 7/3 × 9/14 - 5/6 = 1/1 × 3/2 - 5/6 = 3/2 - 5/6 = 9/6 - 5/6 = 4/6 = 2/3