Номер 809

Розв’яжіть рівняння:

1) x/72 – 13/72 = 29/72

   x/72 = 29/72 + 13/72

   x/72 = (29+13)/72

   x/72 = 42/72

   x = 42

2) (29/42 – а) – 13/42 = 11/42

   29/42 – а = 11/42 + 13/42

   29/42 – а = (11+13)/42

   29/42 – а = 24/42

   а = 29/42 – 24/42

   а = (29 – 24)/42

   а = 5/42

3) 15/17 – (b – 3/17) = 6/17

   b – 3/17 = 15/17 – 6/17

   b – 3/17 = (15 – 6)/17

   b – 3/17 = 9/17

   b = 9/17 + 3/17

   b = (9 + 3)/17

   b = 12/17

4) 29/43 – (m + 13/43) = 5/43

   m + 13/43 = 29/43 – 5/43

   m + 13/43 = (29 – 5)/43

   m + 13/43 = 24/43

   m = 24/43 – 13/43

   m = (24 – 13)/43

   m = 11/43