Сложите дроби и ответ. а) 7/15+8/15 б) 12/7+2/7 в) 15/4+1/4 г) 2/11+9/11

1) 4/7 + 1/2 = 8/14 + 7/14 = 15/14 = 1 1/14 
2) 1/2 + 2/3 + 5/6 = 3/6+ 4/6+ 5/6 =12/6 = 2 3) 5/12 + 3/4 = 5/12 + 9/12 = 14/12 = 7/6 = 1 1/6 4) 3/8 + 3/10 = 30/80 + 24/80 = 54/80 = 27/40 

7/15+8/15=15/15=1
12/7+2/7=14/7=2
15/4+1/4=16/4=4
2/11+9/11=11/11=1