Предмет: Алгебра, автор: nshaposhnik

(7а-5b)(7а+5b)-(4a+7b)^2 упростить выражение

Ответы

Автор ответа: miron2077
18
49а²-25в²-16а²-56ав-49в²=33а²-74в²-56ав
Автор ответа: kazimierz2015
23
(7a-5b)(7a+5b)-(4a+7b)^2= \\ 
(7a)^2-(5b)^2-[(4a)^2+2*28ab+(7b)^2]= \\ 
=49a^2-25b^2-16a^2-56ab-49b^2= \\ 
=(49-16)a^2-56ab-(25+49)b^2=
33a^2-56ab-74b^2 \\
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Предмет: Английский язык, автор: Аноним
Задание3. выберитеправильныйглагол
Example: Kate ______(set/sat) her clothes on the chair a few minutes ago. — set
1. They ________(hanged/hung) the picture on the wall.
2. Ken ________(lay/laid) his shaving brush on the shelf.
3. I_________ (found/founded) the address you wanted.
4. We were so tired after Saturday's party, we _________(lied/ lay) in bed all Sunday morning. 
5. When he _________(set/sat) his glass on the table, he spilled a little drink.

Задание 4. Употребите необходимый вспомогательный глагол в следующих вопросах. Найдите на них ответы в правой колонке.

1. … youknowhisname?

a. No, I didn’t. I don’t like onion even now.

2. … they visit the museum yesterday?

b. Of course. They read two books a year.

3. … you family watch TV tomorrow?

c. Yes, he did. He sold three packager.

4. … his sister learn in the academy&

d. Sorry, but I don’t. Maybe John knows.

5. … you lose your wallet last week?

e. Sure, we will. We like to watch TV in the garden.

6. … they buy a car two days ago?

f. I think, he won’t. He will be busy in the garden.

7. … Ben Jordan go to the cinema with us next Sunday?

g. No, they didn’t. They wanted to buy a Pontiac, but there were only Fords.

8. … your students read English books in the original every year?

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9. … you like onion when a child?

i. Yes, they did. It was very interesting.

10. … he sell a tour package yesterday?

j. No, she doesn’t. She is a schoolgirl.


Задание5.Исправьтеошибки.

He don’t go to school. He is only 5 years old.
He hasn’t written a report yesterday.
The boy shall read a book tomorrow.
He study at college.
You sings well.
She doesn’t eats after six o’clock.
She not like to cook very much.
We buy some new furniture yesterday.
He read a book when the telephone rang.
3He didn’t written a report by yesterday. даю 50 баллов!!!!!!!!!!!!!