Предмет: Математика, автор: Leonidal

Можно ли нарисовать на бумаге 9 отрезков, чтобы каждый пересекался ровно с 3 другими?

Ответы

Автор ответа: Аноним

40

Ответ:
Нет, нельзя.
Решение:
Граф, у которого вершины соответствуют отрезку будет иметь нечётное количество нечётных вершин. Значит, не получится.

Предыдущий вопрос

Следующий вопрос

Похожие вопросы

Предмет: Английский язык, автор: 7776525

3
**Join the sentences using the relative
pronouns/relative adverbs in brackets. Add or
remove words where necessary.
1 Let's visit the market. It is in the Old Town.
(WHICH)
Let's visit the market which is in the Old Town.
2 It has antique stalls. You can find lots of
bargains. (WHERE)
3 My favourite stallholder is Tony. His stall sells
pottery. (WHOSE)
4 The market attracts a lot of visitors. They are
from all over the world. (WHO)
5 Last year, there was a street party. The
market turned 100 years old. (WHEN)
6 The market has a big variety of street food.
It's very tasty. (WHICH)
7 It's got cheap second-hand clothes. That's the
reason it's popular with students. (WHY)

2 года назад

Предмет: Биология, автор: danieltaroyan2

какого различие между клетками дрожжевых грибов и бактериальными клетками

2 года назад

Предмет: Английский язык, автор: lisicaaleksandra9

розповісти про свої/мамині дії , коли ви застудилися. БУДЬ ЛАСКА СРОООЧНООООО. даю 60 балов

2 года назад

Предмет: Английский язык, автор: oen91282

1. When … you … your English lessons?
a) do; have to begin b) have; to begin c) have; got
begin d) are; begin
2. What … she … when she comes back home?
a) does; got to do b) have; got to do c) does; have to
do d) is; have to do
3. He is nervous. Don't look … him for a long time.
a) for b) after c) at d) on
4. Where have you put my new magazine? I have
been looking … it for an hour.
a) at b) for c) up d) after
5. He got well very quickly because you were looking
… him carefully.
a) up b) through c) after d)at
6. — Where have you got these interesting facts?
— I looked them … in the encyclopedia.
a) through b)at c) up d) on
7. —What's the news?
— I don't know yet. I haven't read newspapers yet.
I've just looked … them.
a) after b) at c) through d) in
8. The teacher doesn't like the pupils … at the lesson.
a) talking b) talked c) talks d) talk
9. Can you hear my sister … in the next room?
a) play the piano b) playing the piano c) played the
piano d) plays
10. They suddenly saw a baby … into the river.
a) fall down b) falling down c) fell down d) falls
down

8 лет назад

Предмет: Русский язык, автор: smolletta

Помогите пожалуйста, русский язык

8 лет назад