Помогите:) Na + OH = NaOH 2NaOH + H2SO4 = Na2SO4 + 2H2O Na2SO4 + Ba = 2Na + BaSO4 Указать тип химической реакции(соединения,разложения,замещения,обмена).Назовите все вещества,укажите класс соединений Очень нужно!))

Задача по общей физике!

Задание в приложении

Помогите,пожалуйста,решить. Заранее спасибо! =)

Упростите выражение:

(a-1)^2(a+1)+(a+1)(a-1) и найдите его значение при a=-3

Put the verbs into the passive. Use an appropriate tense.

1 He__________ (just offer) a well-paid job with Radio Four.

2 __________ (the Oscar ceremony report) in the news last night?

3 I think cinema ____________ (replace) gradually by TV and computers in the next century.

4 This programme became very popular after the main presenter______(vote) the most interesting TV personality of the year.

5 _____________ (his next book publish) soon?

6 Some films should_____________ (not watch) by children and they should only (show) on TV after ten o'clock.

7 Look at those men in dark glasses! I think we________(watch).

найдите наименьшее значение функции y=13+3x-x3 на отрезке{-1;1}.