1) 2 1\6 и 3 1\9 ; 2)4 2\7 и 5 4\21; 3)1 3\11 и. 2 1\2; 4)2 8\15 и 1 5\12;

1)
2 1/6 =  2 3/18  и  3 1/9 = 3 2/18;

2)
4 2/7 = 4 6/21  и   5 4/21;

3)
1 3/11 = 1 6/22  и  2 1/2 = 2 11/22;

4)
2 8/15 = 2 32/60  и  1 5/12 = 1 25/60;