Question

Вычислите: 2/5 + 3/5; 3/7 - 2/7; 7/20 - 3/20; 1/9 + 5/9; 6/23 - 2/23; 3/20 + 7/20; 13/29 - 2/29; 11/51 + 13/51; 17/72 - 13/71; 32/55 + 23/55; 5/33 + 6/33; 13/48 - 11/48.

Answer 1

1;1/7;1/5;2/3;4/23;1/2;11/29;24/51;4/72;1;1/3;1/24

Answer 2

2/5 + 3/5 = 5/5 = 1

3/7 - 2/7 = 1/7

7/20 - 3/20 = 4/20 = 1/5

1/9 + 5/9 = 6/9 = 2/3

6/23 - 2/23 = 4/23

3/20 + 7/20 = 10/20 = 1/2

13/29 - 2/29 = 11/29

11/51 + 13/51 = 24/51 = 8/17

17/72 - 13/71 = (1771 - 1372)/(72*71) = 1199/5112

32/55 + 23/55 = 55/55 = 1

5/33 + 6/33 = 11/33

13/48 - 11/48 = 2/48 = 1/24