Предмет: Алгебра, автор: Jkrina

9x^2-21x+6=0 ...............

Ответы

Автор ответа: Atanaro

D = 21^2 - 4*6*9 = 441 - 216 = 225, √D = 15
x1 = 21 + 15 / 18 = 2
x2 = 21 - 15 / 18 = 6/18 = 1/3

Похожие вопросы

Предмет: Математика, автор: kseniasvitic41

Олжас выполнил домашнее задание за 1 час 30 минут. К он потратил 15 минут на заучивание стихов. На решение задачи в два раза больше времени. Остальное время писал эссе. Сколько минут Олжас писал эссе

6 лет назад

Предмет: Английский язык, автор: Аноним

ПоМоГиТе ПоЖаЛуЙсТа
Task 1

Read the text and answer the questions.

A few years ago, I went on a long weekend to the Lake District in the UK. It is a very popular holiday destination in the north of England. I went on my own and had a wonderful time. I stayed in a youth hostel and met some nice people but the most memorable thing about the holiday was the breathtaking views and lovely picturesque villages. It can get very busy with lots of tourists so I decided to go out of season in the autumn. The weather was fantastic and the shops were full of local crafts. A great holiday! It’s certainly not the kind of short break for someone looking for a busy nightlife but if you want to relax in the middle of stunning landscape I would certainly recommend a holiday to the Lake District.

Answer the following questions:
1) Did the person like the accommodation and people there?
2) Did the person have a good time? How do you know?
3) What is the person’s opinion about “tourist season” in that destination?
4) Was the destination busy when he went?
5) What is the person’s opinion about the scenery?

Writing
Task 1
Read the passage and use a suitable word in the box to fill in the gaps.

so when where before after

Nightmare journey

A nightmare journey I remember was three years ago 1) ______ I was going to the airport with my friends. We were going to Alakol on holiday and usually people must to be at the airport two hours 2)_______the flight. 3) _____ we left home three hours earlier, but on the motorway 4) _________ we were driving, it was a huge traffic jam. The traffic wasn’t moving at all! We didn’t know what to do! Only 5) _______ an hour the traffic started moving slowly. I was stressed and said to the driver “We will miss our flight if you drive so slowly!” When we finally arrived at the airport it was only thirty minutes left. We had to run to catch our flight.

Task 2
Write about a journey you have been to. Write a short story. These questions will help you
Where did you go?
Who did you go with?
How did you go with?
Was the journey interesting or boring? Why?
Did you arrive on time or were you late?

6 лет назад

Предмет: Русский язык, автор: ggggjgfhj

В каких случаях НЕ С
Глаголами Пишется
Слитно?
Верных ответов: 2
(Не) дразните собак,
(Не) годует зима,
посылает мороз,
(Не) взлюбила мачеха
падчерицу.
(Не) выйдет из жадины
друга хорошего,

6 лет назад

Предмет: Математика, автор: Аноним

Помогите пожалуйста!!! 1) две целых три четвёртых : (одна целая одна вторая - 25 ) + ( 3/4 + 5/6 ) : три целых одна шестая =? 2) ( 2/15+одна целая семь
двенадцатых ) * 30/103 - 2 : две целых одна четвёртая * 9/32 = ? 3) ( три целых одна вторая : четыре целых две третьих + четыре целых две третьих : три целых одна вторая ) * четыре целых четыре пятых=?

10 лет назад

Предмет: Физика, автор: yk040299

Срочноооооо.......... пожалуйста......Людина повільно піднімає камінь масою 70 кг та об"ємомо 0,03 м в кубе із дна річки на поверхню .Яку роботу здійснює людина , якщо глибина річки 80 см?

10 лет назад