Предварительно сократив дроби, выполните сложение

1) 10/24+21/54 2) 28/40+10/75 3) 14/24+15/40 4) 4/24+3/36

1) 10/24+21/54

10/24 = 5/12

21/54 = 7/18

5/12 + 7/18 = 15/36 + 14/36 = 29/36

2) 28/40+10/75

28/40 = 14/20 = 7/10

10/75 = 2/15

7/10 + 2/15 = 21/30 + 4/30 = 25/30 = 5/6

3) 14/24+15/40

14/24 = 7/12

15/40 = 3/8

7/12 + 3/8 = 28/48 + 18/48 = 46/48 = 23/24

4) 4/24+3/36

4/24 = 2/12 = 1/6

3/36 = 1/12

1/6 + 1/12 = 2/12 + 1/12 = 3/12 = 1/4

=5/12+7/18=5+7/36=15+14/36=39/36=13/12