polinapolina971
12.05.2020 00:01

1. “Where's Almas?” - “I (to know).” A)don't know B) am not knowing
2. What (you / to laugh at )?
A) do you laugh at B) are you laughing at
3. "Where (you / to come from)?" - "Kazakhstan".
A) do you come from B) are you coming from
4. They ….the TV when I came in.
A) watched B) were watching
5. What ….. last Saturday.
A) Were they buying. B) Did they buy
6. Aizhan … that she was not right.
A) was understanding B) Understood
7. Years ago he ___ very poor, and ___ how to live.
A) was/hasn’t know B) was/didn’t know
8. Askhat cannot see well as he ___ short-sighted.
A) became B) has become
9. I ___ much football since I ___ school.
A) haven’t played/left B) didn’t play/left
10. - Have you got ... questions? - Yes, I`ve got ... .
A) Any/some B)some/any
11. I wanted to buy a coat for ... . There were many coats on sale but ... suited me.
A) yourself/not any of them B) myself/none of them
12. If I had time, I … this composition.
A) would write B) had written
13. If he … (be) my friend, I … (invite) him to the party.
A) were/would B) was/would
14. Our house is ... than that house.
A) bigger B) the biggest
15. Many people would say that my job must be ... component of my life.
A) less stressful B) the most stressful
16. Someone is knocking at the door. - Don't stand up. I ... open.
A) will B) am going to
17. Tomorrow is your exam. When ... srart prepairing fo it? - I think I ... pass without any preparation.
A) are you going to/will B) will/will
18. ​Which of the two sentences below is the better or more likely?
А) I’ve worked in the garden all day and now I’m tired.
B) I’ve been working in the garden all day and now I’m tired.
19. Which of the two sentences below is the better or more likely?
A) I’ve finished my homework. Now I’m going to watch TV.
B) I’ve been finishing my homework. Now I’m going to watch TV.
20. Which of the two sentences below is the better or more likely?
A) How long have you known her?
B) How long have you been knowing her?

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Ответ:
голова332
23.01.2023 04:21

А) Определить кол-во корней можно используя дискриминант.

D > 0 => уравнение имеет ровно 2 корня,

D = 0 => уравнение имеет ровно 1 корень,

D < 0 => уравнение не имеет корней.

1) 2x^2-3x+6=0

a = 2, b = − 3, c = 6

D = (− 3)2 − 4 · 2 · 6 = 9 − 4 · 12 = − 39 - уравнение не имеет корней

2) 5x^2-x-4=0

a = 5, b = − 1, c = − 4

D = (− 1)2 − 4 · 5 · (− 4) = 1 − 4 · (− 20) =  1 + 4 · 20 = 81 - имеет 2 корня

Б)Так как корни имеет лишь 2-е уравнение то для него и найдем корни

x1 =   (1 - √81)/(2·5)  =   (1 - 9)/10  =   -8/10  = -0.8

x2 =   (1 + √81)/(2·5)  =   (1 + 9)/10  =   10/10  = 1

Объяснение:

Не благодарите

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Ответ:
Атабек111111
17.05.2020 04:25
One of the most significant economic branches of mass tourism.
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