Предмет: Алгебра, автор: Волченок174

помогите решить, пожалкйста:)
x^3-2x^2-9=0
заранее спасибо)

Ответы

Автор ответа: Valentina6799
0
x^3-2x^2-9=0
х3-2х2-9=(х-3)(х2+х+3)
х-3=0
х2+х+3=0
Д=1-4*3=-11
Д меньше 0
Ответ:3



Автор ответа: Волченок174
0
все понятно)
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Предмет: Английский язык, автор: Аноним
даю 100 баллов Тренировочные упражнения по английскому языку на употребление грамматических времен Past Simple и Past Continuous.
Упражнения - 1.
I__________ (to go) to the cinema yesterday.
I__________________ (to go) to the cinema at four o'clock yesterday.
I ______________(to go) to the cinema when you met me.
I_____________ (to do) my homework when mother came home.
I _________________(to do) my homework yesterday.
I_____________________ (to do) my homework at six o'clock yesterday.
I _______________(not to play) the piano yesterday. I_____________ (to write) a letter to my friend. 1
I __________________(not to play) the piano at four o'clock yesterday. I___________ (to read) a book.

Упражнения - 2.
When I _________(to come) home, my little sister_________ (to sleep).
When Nick __________(to come) home, his brother_________ (to play) with his toys.
When mother__________ (to come) home, I____________ (to do) my homework.
When father____________ (to come) home, Pete__________ (to sleep).
When mother_____________ (to come) home, the children_________ (to play) on the carpet.
When I___________ (to go) to school, I ___________(to meet) my friend.
When we ___________(to go) to the cinema, we____________ (to meet) grandmother.
When grandmother____________ (to go) home, she ___________(to see) many children in the yard.
When I ________(to play) in the yard, I suddenly ______(to see) my old friend.
When Nick_____________ (to run) about in the yard, he___________ (to fall).

Упражнения - 3.
1. At this time yesterday I _________(to sit) at the theatre.
2. He ____________(to come) back to St. Petersburg on the 15th of January.
3. I___________ (to go) to the institute when I____________ (to see) him.
4. At this time yesterday we____________ (to have) dinner.
5. He____________ (to write) a letter when I ______________(to come) in.
6. He ___________(to make) a report when I___________ (to leave) the meeting.
7. Yesterday he__________ (to write) a letter to his friend.
8. When I __________(to look) at them, they _________(to smile) at me.
9. What you ___________(to do) at six o'clock yesterday?
10. I __________(to go) to bed at half past eleven.
11. Yesterday the lesson_____________ (to begin) at nine o'clock.
12. The cat _____________________(to take) a piece of fish 'and then (to run) away.
13. He_______________ (to read) a newspaper when I__________ (to come) in.
14. Yesterday I______________ (to get) up at seven o'clock.
15. He _________(to put) on his coat and cap, ___________(to open) the door and_________ (to go) out.