Предмет: Геометрия, автор: juli198464

з точки D опущено перпендикуляр DE на площину β, точка F належить площині β. Знайдіть: 1) DF, якщо DE = 5 см, EF = 12 см; 2) EF, якщо ∟DEF = 45◦, EF = 7√2

Ответы

Автор ответа: sofiasemenovna100

2

Ответ:

а) 13 см

б) 7 корней 2

Объяснение:

решение на фото..........

Приложения:

Предыдущий вопрос

Следующий вопрос

Интересные вопросы

Предмет: Русский язык, автор: вкусняшка22

220 ................. ......

2 года назад

Предмет: Английский язык, автор: musa727272

ТЕСТ ПО ИНОСТРАННОМУ ЯЗЫКУ ! ВЫБЕРИТЕ ПРАВИЛЬНЫЙ ОТВЕТ! ЭТО СРОЧНО ПОМОГИТЕ ПОЖАЛУЙСТА !
Баллов: 1
.... your sister want to buy a new radio-set?
Выберите один ответ.
has
do
does
is
Question 2
Баллов: 1
He ... be in this room.
Выберите один ответ.
is
must
has
ought
Question 3
Баллов: 1
What ... wonderful weather it is today!
Выберите один ответ.
the
---
an
a
Question 4
Баллов: 1
If it... again, I don’t know how to dress.
Выберите один ответ.
had rained
will rain
rain
rains
Question 5
Баллов: 1
If my advice ..., I’ll be so happy!
Выберите один ответ.
will help
have helped
help
helps
Question 6
Баллов: 1
There are … foreign students in our institute.
Выберите один ответ.
little
someone
a fewer
few
Question 7
Баллов: 1
Several … were sitting in the garden.
Выберите один ответ.
women
woman
womans
womans
Question 8
Баллов: 1
Show … the plan of our work.
Выберите один ответ.
they
their
theirs
them
Question 9
Баллов: 1
Must I describe the picture? No, you ... not.
Выберите один ответ.
may
must
need
can
Question 10
Баллов: 1
Look, your brother ... home.
Выберите один ответ.
go
is going
goes
going
Question 11
Баллов: 1
My father ... home at 5 o'clock yesterday.
Выберите один ответ.
has come
came
comes
was coming
Question 12
Баллов: 1
This is the monument I told you about. There are a lot of flowers around … .
Выберите один ответ.
it
them
him
its
Question 13
Баллов: 1
When are you … to do this task?
Выберите один ответ.
are finishing
finished
finish
finishing
Question 14
Баллов: 1
I picked up … interesting knowledge on that course.
Выберите один ответ.
a lot
some
many
a few
Question 15
Баллов: 1
… you play tennis?
Выберите один ответ.
may
must
have
can
Question 16
Баллов: 1
… task is the most difficult.
Выберите один ответ.
him
its
his
you
Question 17
Баллов: 1
His money ... on the shelf.
Выберите один ответ.
have been
are
were
is
Question 18
Баллов: 1
We did this homework … .
Выберите один ответ.
ourselves
itself
myself
themselves
Question 19
Баллов: 1
I … to help you.
Выберите один ответ.
shan't be able
shan't be allow
can
shan't have
Question 20
Баллов: 1
He … go skiing.
Выберите один ответ.
will do
will allow
will be able to
will have
Question 21
Баллов: 1
When … the 365th anniversary of Rembrandt's birth celebrated?
Выберите один ответ.
does
do
did
was
Question 22
Баллов: 1
- Must we hurry? - No, you ..., we have so much time.
Выберите один ответ.
may not
needn’t
can’t
won’t
Question 23
Баллов: 1
Does it sometimes ... in summer?
Выберите один ответ.
snows
snow
snowed
snowing
Question 24
Баллов: 1
My brother ... home late as a rule.
Выберите один ответ.
coming
is coming
come
comes
Question 25
Баллов: 1
Are there ... students in the reading-room?
Выберите один ответ.
any
no
some
not any
Question 26
Баллов: 1
We ... to stay at home because it was raining.
Выберите один ответ.
have been
had
has
will
Question 27
Баллов: 1
I can't see … .
Выберите один ответ.
they
theirs
them
their
Question 28
Баллов: 1
I live in this house. There is a bus stop in front of … .
Выберите один ответ.
its
it
her
him
Question 29
Баллов: 1
… news is very interesting in this journal.
Выберите один ответ.
many
few
the
a
Question 30
Баллов: 1
She usually … all materials herself.
Выберите один ответ.
will type
types
type
is typing
Сохранить, но не отправлять

2 года назад

Предмет: Английский язык, автор: Алиса123446585

Напишите как читается

Lisa Simpson is 8 years old. She's short and she's got fair hair. She is very clever. She can sing and play the saxophone and she can speak Swedish and French.

Bart Simpson is 10 years old. He is short with fair hair. He is naughty and noisy. He likes comic books and skateboarding. He can speak French. He has two sisters, Lisa and Maggie.

Homer Simpson is the father of the family. He is 39 years old and is tall and fat. He likes eating and drinking very much. He is not very clever, but he's funny.

Maggie Simpson is the baby of the family. She is small and she has got fair hair. She can't walk and she can't talk, but she can play the saxophone. She is quiet, friendly and very clever.

Marge Simpson is the mother of the family. She is 38 years old. She is tall and slim and her hair is blue! She can cook well and she is very patient and kind. She is afraid of flying.

2 года назад

Предмет: Русский язык, автор: adlet58

Указательные местоимения тот , этот , такой изменяются по родам , подежам и числам

8 лет назад

Предмет: Русский язык, автор: ArinaBulatova

помогите пожалуйста , русский

8 лет назад