Предмет: Математика, автор: Y1000

ребра прямоугольного параллелепипеда равны 3 сантиметра 4 сантиметра и 5 сантиметров .а)Найдите площадь его основания и площадь боковой поверхности то есть сумму площадей боковых граней .б)Найдите площадь прямоугольной поверхности прямоугольного параллелепипеда. Объясните почему в задание "а"могут получиться три разных ответа.
ответе пожалуйста.

Ответы

Автор ответа: Olia03Балтийск
0
а)5х3=15,4х3=12,5х4=20,ответа получается 3,потому что за переднюю сторону может приняться не один вариант,то есть за боковую тоже
б)2(5х3+4х3+5х4)=2х47=94
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Grammar

1​Complete the sentences and questions. Use the correct form of the verbs in brackets.

1 Look out! The baby is going _______________ (drop) your e-book reader in the water!

2​Promise me you _______________ (not spend) all your money on an expensive tablet PC!

3​If you _______________ (heat) water to 100°C, it boils.

4​If I don’t see the film, I _______________ (be) disappointed. I'm really looking forward to it.

5​If the man was innocent, the police _______________ (release) him.

6​I wish I _______________ (know) the answer to the question, but I don’t.

7​When we arrived at the cinema, the film _______________ (already / start) and we missed the beginning.

8​If I _______________ (speak) German every day, I would become fluent very quickly.

9​Lily _______________ (fail) her exams if she doesn’t start studying.

10​That was lucky! All the children _______________ (go) home when the school caught fire.


Mark: ___ /10

2​Rewrite the sentences.

1​Marie Curie discovered radium in 1898.

​Radium ________________________________________________________________.

2​‘I haven’t seen Julie since Tuesday,’ said Dennis.

​Dennis said _____________________________________________________________.

3​I can’t play on the basketball team and I’m disappointed.

​I wish __________________________________________________________________.

4​They will sell tickets for the Olympic Games online.

​Tickets __________________________________________________________________.

5​It is necessary to recycle glass and paper.

​You _____________________________________________________________________.

6​It is possible that she will go to university.

​She _____________________________________________________________________.

7​They deliver milk on Tuesdays and Fridays.

​Milk _____________________________________________________________________.

8​Someone has seen the thief in this neighbourhood.

​The thief __________________________________________________________________.

9​It isn’t necessary to send flowers.

​You ______________________________________________________________________.

10​The boys said they were going to the cinema.

​‘We ___________________________________________________________,’ said the boys.