Question

Предварительно сократив дроби выполните сложения, 1-ый пример пожалуйста с объяснением. 1)3/12 + 25/30 2)10/24+21/54 3)30/54+22/30 4)28/40+10/75 5)1217 +1421 6)1424 + 1540 7)1218 + 5/60 8) 424+336  Можете фоткой прислать.

Answer 1

1) 3/12 + 25/30 = 1/4 + 5/6 = 3/12 + 10/12 = 13/12 = 1 1/12
2) 10/24 + 21/54 = 5/12 + 7/18 = 15/36 + 14/36 = 29/36
3) 30/54 + 22/30 = 5/9 + 11/15 = 25/45 + 33/45 = 58/45 = 1 13/45
4) 28/40 + 10/75 = 7/10 + 2/15 = 21/30 + 4/30 = 25/30 = 5/6
5) 12/17 + 14/21 = 12/17 + 2/3 = 36/51 + 34/51 = 70/51 = 1 19/51
6) 14/24 + 15/40 = 7/12 + 3/8 = 14/24 + 9/24 = 23/24
7) 12/18 + 5/60 = 2/3 + 1/12 = 8/12 + 1/12 = 9/12 = 3/4
8) 4/24 + 3/36 = 1/6 + 1/12 = 2/12 + 1/12 = 3/12 = 1/4