5^2 x - 4*5^x- 5 = 0

Если массовые доли элементов С= 53,35 , Н=15,6% , N=31,1%

а) С2 Н5 NH2

b) C3 H7 NH2

c) C4 H9 NH2

d) CH3 NH2

Что из названного являлось органом самоуправления в Ведиком Новгороде в 12-15 веках

2cos^2альфа/2 - cosальфа варианты ответа; 1 2 3 4 5

Ex. 98 Раскройте скобки, употребляя глаголы в Present Simple, Present Progressive, Past Simple, Past Progressive, Present Perfect, Present Perfect Progressive.

It ... (rain) all day today. I ... (suspect) it ... always (rain) on Sundays in England. Anyhow, it ... (rain) every Sunday since I... (arrive) here three months ago. I ... just (begin) to get used to it but I ... (find) it rather monotonous! I ... (live) in a boarding-house in Bayswater as I ... (not, possess) enough money to stay in a hotel or a flat of my own. However, I... (enjoy) my stay here as I ... already (have) many opportunities to meet interesting people who ... (come) from all over the world. Like me, they ... (study) English or else they ... (work) with foreign firms that have branches or agencies here. Some of them ... (live) here for quite a long time but even they ... (not, all, speak) English very well. My friend Peter, for instance, who ... (come) from Basel, and ... (come) here a year ago, ... still (speak) with a strong Swiss accent. He says this is because he ... (work) long hours with an export-import firm where they ... (speak) little English. Although I ... (be) here only three months, I ... (pick) up enough English to be able to correct Peter frequently, but as I ... (learn) English at school here, I have an unfair advantage over Peter, who is a good fellow, and ... (be) most helpful in showing me about London during the first weeks of my stay.