реши уравнение 3/4 -(х+1/20)=1/5

Ок!

3/4-1/5=х+1/2011/20=х+1/20х=10/20х=1/2

3/4 - (х + 1/20) = 1/5х + 1/20 = 3/4 - 1/5х + 1/20 = 15/20 - 4/20х = 11/20 - 1/20х = 10/20 = 1/2 Проверка3/4 - (1/2 + 1/20) = 1/53/4 - (1/2 + 1/20) = 1/515/20 - (10/20 + 1/20) = 1/515/20 - 11/20 = 1/54/20 = 1/51/5 = 1/5