Предмет: Геометрия, автор: kkissa

На оси Z найдите точку, равноудаленную от двух точек А(-2,1,4) и В(3,0,1)

Ответы

Автор ответа: IUV
0
если на оси z то ее координата имеет вид (0 0 z)
дальше считаем квадрат расстояния от точки А до (0 0 z) и от точки В до (0 0 z)
они равны по условию
2^2+1^2+(4-z)^2=3^2+0^2+(1-z)^2
5+(4-z)^2=9+(1-z)^2
5+16-8z+z^2=9+1-2z+z^2
11=6z
ответ (0;0;11/6)





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Предмет: Английский язык, автор: zeroheroone
Здравствуйте, надо ответить на вопросы по данному тексту!

"I usually get up at about 8 o'clock. Then I have breakfast – coffee or tea and some toasts. After this I go down to the library and read the paper. There are a lot of us at the library. We never say we are unemployed but we know. I look at all the possible jobs in the papers (This takes about a minute!). I read the sports and the arts pages, and soon it is time for lunch, so I go off down to the shops for bread, milk, fresh vegetables and 25 pence worth of cheese. I like shopping, and I like cooking now too. On the way back from the shops I buy a local paper and look at the jobs advertisements over lunch (soup and bread and butter).

After "lunch" on Mondays and Wednesdays I go to a carpentry class. These classes are free for unemployed people. It is important to do a lot of things when you are unemployed. You need a routine for the day. On the other days of the week I go for walks if the weather is all right, or I read. At about 6 o'clock I start preparing the Big Meal of the day. I take a lot of time over this. It's usually vegetables and cheese, or sometimes spaghetti. After supper my wife and I read, or play chess. Every Friday we go to a pub, or to the cinema. I don't watch TV much. Usually at 10.30 we turn off the heater and go to bed."

Вопросы:
1. Have you …? No, I haven't. I'm unemployed.
2. What time ...? At eight o'clock.
3. What...? Coffee or tea, and toast.
4. Where …? To the library.
5. Why…? Because I want to read the papers.
6. Which parts …? The job advertisements, the sports ads, arts
pages.
7. What ...? I go shopping and I buy a local paper.
8. What …? Usually I have soup and bread and butter.
9. What...? I go to a carpentry class.
10. When …? On Monday and Wednesday afternoons.
11. What …? I go for a walk or read.
12. When …? At about six.
13. What …? Talk, play games or read.
14. Do …? No, not much.
15. When …? At about 10:30.