2     1      8      5      13 
 8 - + 3 - = 8 -- + 3 -- = 11 --
   5     4     20     20      20 

   2     1      8      5      3 
 8 - - 3 - = 8 -- - 3 -- = 5 --
   5     4     20     20     20 

   2     1   42   13   21   13   273       3 
 8 - x 3 - = -- x -- = -- x -- = --- = 27 --
   5     4    5    4    5    2    10      10 

   2     1   42    4   168     38 
 8 - : 3 - = -- x -- = --- = 2 --
   5     4    5   13    65     65 

2.708(3) = 
   177      1     2124      1     2125     17 
 2 --- + ---- = 2 ---- + ---- = 2 ---- = 2 --
   250   3000     3000   3000     3000     24