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Как построить с помощью циркуля и линейки отрезок x равный (a+b)*b/a
если даны отрезки a и b-
Предмет:
Математика -
Автор:
baby makergkyg - 6 лет назад
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Ответы 1
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Строим отрезок равный (а + в) . С помощью циркуля и линейки проводим перпендикуляр через середину отрезка (а + в) . Отрезок от одного конца отрезка (а +в) до точки пересечения перпендикуляра с отрезком (а +в) будет равен отрезку (а + в) /2. Строим окружность с центром в точке пересечения перпендикуляра с отрезком (а +в) и радиусом равным отрезку (а + в) /2. Проводим перпендикуляр к отрезку (а +в) в точке, где отрезок а стыкуется с отрезком в. Проводим этот перпендикуляр до пересечения с окружностью. Отрезок от точки пересечения перпендикуляра сокружностью до точки ппересечения перпендикуляра с отрезком (а +в) будет искомым отрезком, равным корню из а*в.
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Автор:
rene - 6 лет назад
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1. The second witness's evidence more convincing. _it____ made me believe that the suspect is innocent..
a) are, it
b) is, it
c) are, they
d) is, they
2. In spring of following year we went____abroad and were absent several months. Навесні наступного року ми пішли за кордоном і були відсутній кілька місяців
a)__, the, ___
b) the, the, the
c) , ,
d) the, the
3. I see only five boys here. Where are ones?
a) another
b) others
c) the others
d) the other
4. You've been ____ working _____.
a) hardly, lately
b) hard, lately
c) hard, late
d) hardly, late
5. I ___ Jack lately. When ____ him last? — I ___ him two days ago. I ____ that he ____ very much.
a) did not see, have you seen, met, thought, changes
b) have not seen, did you see, met, think, changed
c) have not seen, you saw, met, think, changed
d) do not see, have you seen, have met, thought, would change
6. Noah Webster An American Dictionary of the English Language in two volumes in 1828, and since then it the recognized authority for usage in the United States.
a) published, became
b) has published, has become
c) published, was becoming
d) published, has become
7. I never them when I lived in London.
a) had met
b) have met
8. In case the weather ___ good, they ___ fishing
a) will be, will go
b) is, go
c) will be, go
d) is, will go
9. They ___ to build a new McDonalds in several days and ___ it by the end of the year.
a) will start, will finish
b) are starting, will have finished
c) start, will be finishing
d) start, are finishing
10. Сейчас здесь строится новый супермаркет.
a) is being built
b) is building
c) is built
11. The doctor there nothing to worry about if the fever ___ above 38,5°.
a) said, was, would not go
b) tells, is, will go
c) says, had been, went
d) said, was, did not go
12. There are a lot of people who expect your country ___ the same as their own.
a) not to be
b) not being
c) not be
13. The rain seems ___. Call the children in. I do not want them ___.
a) to be, to be got wet through
b) to be starting, to get wet through
c) to have started, to have got wet through
d) to have been started, to be getting wet through
14. I wonder if there is any use ___ ___ him.
a) trying, improving
b) trying, to improve
c) to try, to improve
d) to try, improving
15. She had a good practical knowledge of French __ as an interpreter for many years in France.
a) working
b) having worked
c) worked
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a) to see, coming in, have welcomed, as usually
b) having seen, to come in, welcoming, usually
c) on seeing, come in, having welcomed, as usual
d) after seeing, having come in, to welcome, in a usual way
17. Mrs. Sparred ___ very beautiful when she was young. She has a fine face.
a) was to be
b) must have been
c) must be
18. You it long ago.
a) must do
b) should have done
c) needn't have done
d) are to do
19. Let's wait a little. He ___ .
a) may have come
b) could have come
c) may come
d) might have come
20. He had to earn ___ living at ___ an early age, ___?
a) ___, such, hadn’t he
b) his, such, didn’t he
c) himself, so, hadn’t he
d) to, so, didn’t he
21. 1 don't know how him. I wish I his name.
a) address, did not know
b) to address, knew
c) addressing, would know
d) to address, should know
22. ___ 1812 Russian fur traders established Fort Ross ___ California's northern coast and it functioned ___ a Russian trading post ___ 1841 when, ___ order from Alaska, the fort was dismantled.
a) in, on, as, until, by
b) on, at, as, by, through
c) at, in, like, till, at
d) during, along, like, in, by
23. He walked into ___ Green Park that he might cross to ___ Victoria Station and take ___ underground into ___City.
a) the, , the, the
b) the, the, the, the
c) ___ , ___, ___, ___
d) ___, ___, an, ___
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