Номер 1256

1) x – 4 5/11 = 5 6/11
   x = 5 6/11 + 4 5/11
   x = 10
   10 – 4 5/11 = 5 6/11
   5 6/11 = 5 6/11

2) 7 18/49 – x = 2 18/49
    х = 7 18/49 – 2 18/49
    х = 5
    7 18/49 – 5 = 2 18/49
   2 19/49 = 2 18/49

3) x + 2 8/13 = 11
   x  = 11 – 2 8/13
   x = 8 5/13
   8 3/13 + 2 8/13 = 11
   11 = 11

4) x – 7/11 = 8 4/11
   x = 8 4/11  + 7/11
   x = 9
  9 – 7/11 = 8 4/11
  8 4/11 = 8 4/11