Перейти к выбору ответа 04.05.2022(х-1)в квадрате+(х+2)в квадрате-(х-3)(х+3)=22 Выбрать другой вопрос Смотреть ответ Перейти к выбору ответа Алгебра Ответ учителя по предмету Алгебра (х-1)^2+(х+2)^2-(x-3)(x+3)=22 x^2-2x+1+x^2+4x+4-x^2+9=22 x^2+2x-8=0 D=4+32=36 x1;2= (-2+-6)/2 x1=2 x2=-4
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Test 3
1. Excuse me, do you speak English? I … for a hotel.
a) look c) was looking
b) am looking d) have been looking
2. Last summer we wanted a relaxing holiday, so we … to stay on a small island.
a) choose c) had chosen
I
b) have chosen d) chose
3. Mathematics … hard. I don’t understand it.
a) are c) was
b) is d) were
4. While we … for the train, it started to rain.
a) waited c) was waiting
b) are waiting d) were waiting
5. The police officer said that every house in that street … already by the police.
a) search c) had been searched
b) were searched d) searched
6. There is going to be a big art exhibition. It… a lot of visitors.
a) attracts c) has attracted
b) will attract d) attracted
7. The result of his investigation … in the newspaper soon.
a) publish c) will be published
b) be published d) is published
8. When they arrived home, their children … outside the door waiting for them.
a) sit c) was sitting
b) are sitting d) were sitting
9. We … a new computer not long ago. Now the job will be done much more quickly.
a) had bought c) bought
b) was bought d) have bought
10. He was sorry that he … to me for so long.
a) didn’t write c) hadn’t been writing
b) haven’t been writing d) hasn’t been writing
11. The ring you found … be returned to an old lady who had lost it.
a) can c) have to
b) must d) are to
12. Everybody in our team played … except the captain.
a) bad c) worst
b) badly d) the worst
13. You know much, but you know … than your teacher.
a) little c) least
b) less d) much
14. Small shops are not as … as supermarkets.
a) more convenient c) most convenient
b) convenient d) the most convenient
15. Sarah is a very good pianist. She plays … piano very well.
a) a c) the
b)an d)-