Осуществить цепочку превращения Na->Na2O2->Na2O->NaO2->Na2O

Даны векторы a{12;6}, b{-1;7} Найдите координаты векторов c=a+b и d = 2b-a

На стеклянную пластинку пипеткой нанесите несколько капель воды. Наклоните пластинку.Что вы наблюдаете? ЧТО Я НАБЛЮДАЮ????ПОЖАЛУЙСТА ПОМОГИТЕ!! МНЕ СРОЧНО!! Пожалуйста помогите!!!!! СРочно!!

расставить коэфициенты 

PbS+H2O2---> PbSO4+H20

H202+KMnO4 + H2SO4 ---> O2 + MnSO4 +K2SO4 + H20

KMnO4 +HCl --> KCl + MnCl2 + Cl2 + H20

KMnO4 + HCl ---> MnCl2 + Cl2 + H20 

Привет, всем) Срочно нужен перевод. Заранее спасибо:*
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In the last thirty years, the Internet has grown dramatically. In 1983, there were only 200 computers connected to the Internet; now there are around 50 million and this growth is clearly going to continue.

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