3/9 + 5/54= 3*6/9*6 + 5/54 = 18/54+5/54= 23/54

6/36 + 2/6= 6/36 + 2*6/6*6 = 6/36 +12/36 =18/36= 0,5

4/6 + 1/4 = 8+3/12 = 11/12

7/8 + 2/9 = 63+16/72 = 1 7/72

9/81 + 6/9= 9+ 12/81 = 21/81 =7/27

4/12 + 8/2 = 4+48/12 = 52/12 = 26/6 = 4 2/6 = 4 1/3

1) 23/54 дробь

2)1/2 дробь

3)11/12 Дробь

4)79/72 дробь

5)7/9 дробь

6)13/3 Дробь