Решите ур: х/72-13/72=29/72 второе:(29/42-а)-13/42=11/42 ТРЕТЬЕ:
ПОМОГИТЕ ПОЖЖЖЖЖ
1) x/72 - 13/72 = 29/72 x -13 = 29 x = 42 2) (29/42 -a) - 13/42 = 11/42 -a + 16/42 = 11/42 -a = -5/42 a = 5/42