Предмет: Математика, автор: Maloryyy

Найбільше і найменше значення функції на відрізку
Треба виготовити конічну лійку з твірною, що дорівнює 20 см. Якою має
бути висота лійки, щоб об’єм був найбільшим?

Ответы

Автор ответа: pidorasss55
0

Ответ:

Щоб знайти найбільше значення функції на відрізку, потрібно взяти похідну та розв'язати рівняння f'(x) = 0. Ці значення x визначають екстремуми. Далі перевірте значення функції у цих точках та на кінцях відрізку, щоб знайти найбільше і найменше значення.

Щодо лійки, для знаходження максимального об'єму, використовуйте формулу для об'єму конуса: V = (1/3)πr^2h, де r - радіус основи, h - висота. Оскільки радіус не вказаний, потрібно виразити його через висоту та обмеження та підставити в формулу для об'єму. Після цього вам допоможе знайти критичні точки та визначити, яка висота дає максимальний об'єм лійки.

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Предмет: Английский язык, автор: maximchil
Read the article. Are the sentences true or false?

Windsurfing
by John Marshall

I always dreamt of playing ice hockey or gymnastics
or another really difficult sport – where the crowd is
shouting your name to get you to win! But I’ve always
been a bit hopeless at sport and I’m not in any of
the school teams. So that’s not going to happen any
time soon!
So it was great to get the opportunity to join in with
something when my school suggested a windsurfing
trip for our year. I was a bit worried, though, that I had
no equipment suitable for windsurfing, so Dad took me
to get a few things, including trainers that wouldn’t slip
in the wet. By the time we got back from the shops, I
was feeling really positive about the whole thing!
The day finally came and off we went on the school
minibus to a lake just 15 minutes away from the town
where we go to school. It was a sunny day, but quite
windy too, so it was perfect for windsurfing – or at least
that’s what our teacher said! We met our instructor and
he was really friendly. We all rushed off the minibus and
into the training room, where we got some instruction
before we set off. We got our lifejackets, too – some

people thought they didn’t need them because they
were really good swimmers, but I think secretly we all
knew how important they were.
Then out we went to the lake! We each had our own
small windsurfer at one end of the lake. I was really
worried at first about crashing into another windsurfer –
but then I quickly got the hang of it and it was fantastic!
I could feel the wind in my face. I was going really fast ...
and then suddenly – Splash!!
I still don’t know how I managed to fall off the
windsurfer, but I ended up in the water – and it was
freezing! The instructor got to me really quickly and
pulled me out. Everyone was laughing, including
me – and it wasn’t long before some of the others fell
into the water, too! Nobody minded – we were all just
having fun.
The day was over really quickly and we were soon back
on the minibus. But I knew it definitely wouldn’t be the
last time that I went out on a windsurfer!
1 John thinks there’s a chance that one day he will be in a school sports team.
2 John was more excited about his windsurfing trip after he’d got suitable equipment.
3 John’s teacher was pleased with the weather conditions on the day of the trip.
4 Soon after John set off across the water, he hit another windsurfer.
5 John was upset that people laughed at him when he fell into the water.
6 John decided by the end of the trip that he wanted to go windsurfing again.