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

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

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