67085-К: 90=59375

700. (83400:m) = 420000

1)

67.085 - К: 90 = 59.375

- К: 90 = 59.375 - 67.085

- К: 90 = - 7.710

К: 90 = 7.710

К = 7.710 * 90

К = 693.900

проверка:

67.085 - 693.900 : 90 = 59.375

67.085 - 7.710 = 59.375

59.375 = 59.375

2)

700 * (83.400 : m) = 420.000

83.400 : m = 420.000 : 700

83.400 : m = 600

m = 83.400 : 600

m = 139

проверка:

700 * (83.400 : 139) = 420.000

700 * 600 = 420.000

420.000 = 420.000