Предмет: Математика, автор: elizavetavanina

прямые а и в лежат в параллельных плоскостях альфа и бетта.могут ли эти прямые быть:а) параллельными б) скрещивающимися

Ответы

Автор ответа: apekkoeva

1.Прямые а и в лежат в параллельных плоскостях альфа и бетта. Могут ли эти прямые быть:а)параллельными. б)скрещивающимся?Сделайте рисунок для каждого возможного случая.2.Через точку О, лежащую между параллельными плоскостями альфа и бетта, проведены прямые l и m. Прямая l пересекает плоскости альфа и бетта в точках А1 и А2 соответсвенно прямая m- в точках В1 и В2.Найдите длину отрезка А2В2, А1В1=12см, В1О:ОВ2=3:4.3.Изобразите параллелепипед АВСДА1В1С1Д1 и постройте его сечение плоскостью , проходящей через точки М,N и К, являющиеся серединами ребер АВ,ВС и ДД1.

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Английский язык, автор: dasabucackaa

срочно помогите Mellish school is in the slums of Brooklyn for pupils between twelve and fifteen years of age. There are about 1500 pupils there, and 90 teachers.
It’s a problem school, perhaps one of the most difficult schools in America. The white teachers can’t walk to the school because they may be attacked. They all drive to school, and their cars have special locks. There’s always a black policeman at the door of the school. He has a radio contact with the school guards. Pupils must have a written permission from the teacher if they want to go to the toilet. There’s a guard outside the washroom. Only one child can go into the washroom at a time, and he can’t stay there long.
The children who live in that district go to that school. They are all black children. However, why do the teachers work there?
“It’s very hard of course,” says Jane Flinch, a forty- five-year-old teacher. Most children have problems at home. Some of them are beaten by their parents. Some of them sleep at the lessons because they had to work at night. Some of the children get sick at the lessons because they didn’t have breakfast or even a meal for a day or two.
It’s the love of the job that keeps the teachers in that school. They teach and do social work. They feel that they are doing something good for the children who need help.
“There’s also the problem of violence,” says one of the teachers. “Sometimes when I go into a class, I can feel that some of the children are like a dynamite. However, I feel quite safe. I am sure that other pupils will help me.” There is very little money for teaching in that school. There is no money to buy food for the children.
The principal of the school has been there for many years. A lot of his happy optimism has gone. “No, I’m not optimistic about the future. Look around you,” he says and points out of the window at the high wall round the school. ”It’s not a very bright sight: buildings have holes instead of the windows, shops are closed, groups of people are sitting on the steps of the houses. They have nowhere to go and nothing to do.”
“We need money,” he says, “money is the only way to help this school and these people, and, of course, jobs for the people.”
Задания к тексту.
Exercise 1. Подберите правильный ответ.
Mellish school is for
a) small children.
b) older children.
c) small and older children.
The white teachers can’t walk to school because
a) they live far from the school.
b) they don’t like to walk.
c) it’s dangerous for them.
There’s a policeman
a) at the door of the school.
b) near the toilet.
c) outside the washroom.
The white teachers work there because
a) they can’t find a better job.
b) they love their job.
c) they get a lot of money there.
The school needs
a) more money
b) more teachers.
c) more policemen.
вот срочно надо

6 лет назад

Предмет: Русский язык, автор: aliyushka2

1. Прочитайте текст. Определите тему текста, озаглавьте его. Сите, стате про-
пушенные буквы, расставьте недостающие знаки преrіенания
свеч...ра земля Древ..я в с...ду и крыши сосених домов были
Мы ждали зиму и вот она пришла
тёмными. Вдруг поз. Но вечером вместе с дождем посыпались на зем-
лю б...льшие сн...жинки. За ноч. сне... укрыл все вокруг куру небо
Зима воскликнули мы, когда посм...трели в окно.
Первое зимнее утро праздник земли. Нам ука....но хотелось взять санки,
лыжи и б...жать к горк...
Но надо было идти в школу. Как долго т.нулись уроки в этот радостный
раз...яснилось,
• Определите тип и стиль текста.
Запишите её в тетрадь.
• Определите тип и стиль текста.
объясните знаки препинания в пятом и шестом предложениях, составьте схемы.
. Найдите в последнем абзаце глагол, употреблённый в переносном значении.
Определите по толковому словарю его лексическое значение.
• Подберите к выделенным в тексте словам синонимы и антонимы. Выпишите их
день!
парами. СРОЧНО ПЖЖЖЖЖЖ

6 лет назад

Предмет: Английский язык, автор: 963201

Task 2. Writing.

Complete the sentences, using Conditional I, II, III.

1. If you (buy) coffee, we would drink tea.

2. If he were free, he certainly (to come) to our party.

3. My brother would not have missed so many lessons if he (not to hurt) his

leg.

4. If my friends (to work) in my office, we would meet every day.

5. If you speak English every day, you (to improve) your language skills.

6. If you had got a "five", your mother (to be) happy.

7. If she (to return) earlier, she would have been able to see him before he left.

8. If these shoes were not too big for me, I (to buy) them.

9. If he (to ring) me up, I would have told him a secret.

10. If he (to come) to our house yesterday, he would have met his friend.

6 лет назад

Предмет: Физика, автор: Kreem

Определить длину нити маятника на поверхности Земли, если его период 5с.

9 лет назад

Предмет: Математика, автор: nataliakorotko

Зашифруй тем же шифром предложение:
математика-царица всех наук.

9 лет назад