Question

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;

Answer 1

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;

Answer 2

It looks like you have provided several pairs of numbers separated by the word "and". It is not clear what operation or comparison you would like me to perform with these numbers. Could you please provide more context or information about what you would like me to do?