Решите систему

х+у=4

х+2у=5

Бесконечно длинный прямой проводник с током 40 А имеет изгиб в виде не перекрещивающейся петли радиусом 64 см. Найти напряженность магнитного поля в центре этой окружности.

Составьте фрагмент молекулы ДНК! Составные части: p-Ap6pTpA Спасибо.

А)    (2у-1) в квадрате-4(у-2)(у+2)=17

Б)    у - у = -3

        _______

        4  8     4

Раскройте скобки, употребив правильную глагольную форму.

а)

There (1 — be) a very interesting story in the morning paper about a man who just (2 — inherit) 50,000 dollars. The newspaper article (3 — be) quite detailed. It (4 — say) that the man always (5 — behave) very strangely.

What others (6 — like) he (7 — dislike) and what most people (8 — enjoy) he (9 — hate). He (10 — not bear) the sun, but he (11 — take) long walks in the rain without a raincoat or umbrella. He always (12 — see) the black side of everything. He (13 — find) fault with the best picture of the year but he (14 — stay) up late watching very old films on TV.

Last week his uncle (15 — die) and (16 — leave) him 50,000 dollars. Perhaps the uncle (17 — be) rather strange too. Or perhaps he (18 — know) about his nephew's strange preferences— one of them, anyway — and (19 — decide) to try and cure him.

In his will the old man (20 — insist) that the nephew (21 — spend) half the inheritance within the next two years. In case he (22 — fail) to do that the money (23 — give) to a university. Everyone (24 — want) to know what the nephew (25 — do). You see, the thing he (26 — hate) most of all (27 — be) to part with his money.

b)

There (1 — be) always a big problem with Rex. Mr Smith never (2 — know) where he (3 — go). He (4 — try) to keep him in the garden but it (5 — be) no good. Rex always (6 — bring) something home with him.

One day Mr Smith (7 — come) home tired and (8 — be) soon fast asleep. He (9 — wake up) by a loud knock at the door. Rex (10 — look) at him with one eye. Mr Smith (11 — get up) and (12 — surprise) to see a policeman in the doorway. The policeman (13 — apologize) and told him that there (14— be) a thief in the district stealing from the local shops small things like sweets, chocolates... Mr Smith said that if he (15 — notice) anything he (16 — let) the policeman know. But he knew who it (17 — be).