Длина прямоугольного поля, засеянного пшеницей, 90 метров, а его периметр равен 300 метрам.

Длина прямоугольного поля, засеянного пшеницей, 90 метров, а его периметр равен 300 метрам. Вычисли плошадь поля. Помогите пожалуйста!
- Предмет:
  Математика
- Автор:
  yamiletnovak
- 6 лет назад

Ответы 2

1)90*2=180(м.)-две длины.2)300-180=120(м.)-две ширины.3)120:2=60(м.)-ширина.4)90*60=5400(м2.)Ответ: площадь поля 5400м2
- Автор:
  britshaw
- 6 лет назад
- 0
P=(a+b)*2 - периметр.Подставим: 300=(90+b)*2 300=180+2*b 120=2*b b=60.S=a*b - площадь.Подставим: S=90*60=5400
- Автор:
  primoey3c
- 6 лет назад
- 0
Добавить свой ответ

Еще вопросы

Помогите найти множество значений функции (А5) и производную функции (А6)
- Предмет:
  Математика
- Автор:
  big mac3ywu
- 6 лет назад
- Ответов:
  
  1
- Смотреть
упростить выражение: 2 3/8а+а- 1 1/4 а при а= 2 2/3 СРОЧНО!!!!!
- Предмет:
  Математика
- Автор:
  maximus527
- 6 лет назад
- Ответов:
  
  2
- Смотреть
Помогите Уравнения (456+X)-476=147
- Предмет:
  Математика
- Автор:
  cleodhtn
- 6 лет назад
- Ответов:
  
  2
- Смотреть
Помогите пожалуйста. срочно
1.He said that he … to the theatre the day before.
a. had gone
b. has gone
c. was going

2.The old man told me he … in the country all his life.
a. is living
b. had lived
c. lives

3.During the interview they asked Ann if she … to work on Saturdays.
a. wanted
b. has wanted
c. will want

4.During the interview they asked Ann if she … the job.
a. wants
b. wanted
c. had want

5.During the interview they asked John if he … a job before.
a. has had
b. was having
c. had had

6.I doubted if she … see my point.
a. will
b. shall
c. would see

7.The weather forecast said that … in the afternoon.
a. it will rain
b. it would rain
c. it will be raining

8.James said that he … a horse before.
a. never rode
b. had never ridden
c. would never ridden

9.We didn’t know the score, but we were sure our team … the game.
a. hadn’t lost
b. didn’t lose
c. hasn’t lost

10.Jason ate his dinner very … .
a. quick
b. quicker
c. quickly

11.My puppy is … of all my friend’s dogs.
a. young
b. younger
c. the youngest

12.I am not strong … to help him carry that box.
a. too
b. very
c. enough

13.That was … movie I have ever seen.

a. interesting
b. more interesting
c. the most interesting

14.My father is as … as his father.

a. stronger
b. strong
c. so strong

15.I don’t think they can manage to complete this task. They look so … .

a. exhausted
b. exhausting
c. exhaust

16.By the time I got to the bus-stop, the bus … .
a. was leaving
b. had left
c. left

17.Ann was coming out of the shop when she … Mark.
a. was seeing
b. saw
c. had seen

18.My most unforgettable experience … when I had just finished school.
a. had happened
b. happened
c. was happening

19.I … in Lviv before I moved to Kyiv.
a. lived
b. had lived
c. had been living

20.The old woman was nervous because she … before.
a. didn’t fly
b. hadn’t flown
c. wasn’t flying

21.Yesterday on my way to school I met my friend, whom I … for more than three years.
a. didn’t see
b. haven’t seen
c. hadn’t seen

22.The price _______ in a month. Just wait for it.
a) is reduced b) will be reduced c) reduced
23.The thesis ________ by Martin when we entered the assembly hall.
b) was presented b) was being presented c) is being presented
24. The trip ________ long before we decide to go Paris.
c) has been planned b) was planned c) had been planned
25.The signal _________ before the ship started to sink.
a) was given b) has been given c) had been given

26 The cake ________ by my mother when I entered the kitchen.
a) is being iced b) was being iced c) was iced
- Предмет:
  Английский язык
- Автор:
  lunag5s3
- 6 лет назад
- Ответов:
  
  1
- Смотреть

Длина прямоугольного поля, засеянного пшеницей, 90 метров, а его периметр равен 300 метрам. Вычисли плошадь поля. Помогите пожалуйста!

Ответы 2

Топ пользователей