1 Пример :1) 1/27 + 5/9 = 1/27(1) + 5/9(3) = 1/27+15/27= 16/27 ;
2) 16/27 + 3/1 = 3 Целых 16/27 ;
2 Пример : 1) 2/9 + 5/6 = 2/9(2) + 5/6(3) =4/18 + 15/18 = 19/18 = 1 Целая 1/18;
2) 1 Целая 1/18 +1/18=1 Целая 2/18 =1/9 (Сокращение дроби )
3 Пример : 1)2/15 + 1/5 = 2/15 (1) + 1/5 (3) =2/15 +3/15 = 5 /15 = 1/3 (сокращение);
2) 1/3+3/10 = 1/3 (10) + 3/10(3) = 10/30+9/30=19/30;
4 Пример : 1 ) 3/8 + 5/12 = 3/8 (3) + 5/12(2) = 9/24 + 10/24 = 19/24 ;
2) 19/24+ 1/24 = 20/24 = 5/6 ( сокращенно)
5 Пример : 1)1/4+3/8 = 1/4(2) + 3/8(1) = 2/8 + 3/8 = 5/8 ;
2) 5/8 + 5/16 = 5/8 (2) + 5/16(1) = 10/16+5/16 =15/16 ;
6 Пример :1 )5/7+ 3/14 = 5/7 (2) + 3/14 (1) =10/14 +3/14 = 13/14 ;
2 ) 13/14+1/21 = 3/14(3) + 1/21(2) = 9/42+2/42 = 11 /42 ;