Предмет: Алгебра, автор: Аноним

Дам 90 балов . даже бы пдпбпб

Приложения:

Ответы

Автор ответа: NNNLLL54

1

Ответ:

$1)\ \ \ \displaystyle -4\frac{1}{7}+2\frac{1}{4}\cdot \Big(-11\frac{2}{9}-(-5,4):\frac{9}{35}\Big)=\\\\\\=\frac{29}{7}+\frac{9}{4}\cdot \Big(-\frac{101}{9}+\frac{54}{10}\cdot \frac{35}{9}\Big)=\frac{29}{7}+\frac{9}{4}\cdot \Big(-\frac{101}{9}+\frac{6\cdot 7}{2}\Big)=\\\\\\=\frac{29}{7}+\frac{9}{4}\cdot \frac{-101+9\cdot 21}{9}=\frac{29}{7}+\frac{9}{4}\cdot \frac{88}{9}=\frac{29}{7}+\frac{88}{4}=\frac{29}{7}+22=\frac{183}{7}=26\frac{1}{7}$

$2)\ \ 9x-26=30-5x\ \ ,\ \ \ 9x+5x=30+26\ \ ,\ \ 14x=56\ \ ,\ \ x=4\\\\\\0,4(6-4y)=0,5(7-3y)-1,9\\\\2,4-1,6y=3,5-1,5y-1,9\\\\0,1y=0,8\ \ ,\ \ y=8$

3) Третья часть провода = х м , первая часть = 4х м , вторая часть = (х+114) м .

Уравнение: х+4х+(х+114)=456 , 6х+114=456 , 6х=342 , х=57

1 часть = 4*57=228 м , 2 часть = 57+114=171 м , 3 часть = 57 м .

Предыдущий вопрос

Следующий вопрос

Интересные вопросы

Предмет: Русский язык, автор: galina230658

морфологический разбор слова -метро.

2 года назад

Предмет: Английский язык, автор: uliano4ka92

1. You will... speak Spanish in another few months.
A can
В have
С be able to
D ought
2. I'd like ...skate.
A to can
В to be able to
С to have to
D could
3. Nobody answers the phone. They... be out.
A should
В would
С can
D must
4. I'm sorry. I... have phoned to tell you I was coming.
A should to
В ought to
С had to
D could
5. To ray mind, the government... take care of old people
A ought
В need to
С must
D may
6. I'd like to have... hamburger for... breakfast
A the
В а
С an
D -
7. Pushkin is... outstanding Russian poet.
A the
В а
С an
D -
8. Can you play ...piano?
A the
В а
С an
D -
9. Will you play ...chess with me?
A the
В а
С an
D -
10. At... night I had... terrible headache after I had drunk. I of coffee in... evening.
A the
В а
С an
D -
11. I met my (good) friend yesterday.
A goodest
В better
С best
12. Dorotfiy is (young) in her fiariily.
A the youngest
В the younger
С young
13. Henry is not (strong) his elder brother Bob.
A so strong as
В strong as
С stronger
14. - It isn't very warm today, is it? -No, it is (warm) yesterday.
A more warm
В warmer
C the warmest
15. Your friend looked upset yesterday. I'm today.
A more happy
В happier
С happy as

2 года назад

Предмет: Английский язык, автор: мария2333

From an early age I dreamed of any profession, sometimes - not even for one, but several. Over time I began to think more seriously: "What do I still want to be?", Because the profession is chosen for life. It is important for me that my profession was interesting, well-paid and rewarding for the people around me.

I love animals, I love when they are funny, playful, full of strength and energy. So I decided to statveterinarnym doctor. What attracted me to this profession? I'll try to explain. Firstly, veterinarian job is very interesting, varied and exciting. In my opinion, it can never get bored or boring. A veterinarian is a very important profession, because it determines the life of a living being. It's great to help our little pets, to save their lives, how often do they

2 года назад

Предмет: Русский язык, автор: verakyeohkin

Спиши.Подчеркни буквы ,обозначающие мягкие согласные звуки . Поставь ударение. Собака жила в лесу. Она пошла искать товарища . Собака встретила человека. Она осталась жить у него.

8 лет назад

Предмет: Биология, автор: Hak86532156

Жизненые формы покрытосеменых растений

8 лет назад