Предмет: Алгебра, автор: Mishelka26

Помогите, пожалуйста, решить два примера.
[x+5]>3-x
[x+5]<и= x^2+5


Mishelka26: Извините, не корректно написала. Это модуль.

Ответы

Автор ответа: xacku2020
1

Ответ:

↓↓↓↓

Объяснение:

| x+5 | >3-x

1) {x>-5            {x>-5           {x>-5

  {x+5>3-x      {2x>-2         {x>-1         x>-1  

2) {x≤-5            {x≤-5           {x≤-5

  {-x-5>3-x      {0*x>-2         {x∈R        x≤-5

Ответ x≤-5,x>-1  .

| x+5 | ≤x²+5

1) {x>-5              {x>-5           {x>-5

  {x+5≤x²+5      {х²-х≥0        {x≤0,х≥1 .         -5<x≤0  ,x≥1  

                                +         _         +

х²-х≥0 , х(х-1)≥0 , ____0_____1____.

2) {x≤-5              {x≤-5                  {x≤-5

  {-x-5≤x²+5      {х²+х+10≥0        { решений нет

   х²+х+10=0 ,D<0 корней нет  

Ответ       -5<x≤0  ,x≥1              


Mishelka26: Спасибо огромное!
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Нужен перевод текста и ответить что правда а что не правда.
Помогите пожалуйста.
Everyone has read stories about Sherlock Holmes, who was a famous detective. He was the most famous detective of all time.
The author of all the stories was Sir Arthur Conan Doyle. Once Sir Arthur arrived in Paris. He took a cab and asked the cabman to take him to a big hotel, where he was going to spend the night. The cabman brought him to the hotel. When he received his fare he said, “Thank you very much, Sir Arthur Conan Doyle.” Sir Arthur was surprised, “How do you know who am I?” he asked. “Well, sir, I read in the newspapers yesterday that you were coming to Paris from the South of France. Your hat and your clothes told me that you were English. I put all together and guessed at once that you were Sir Arthur Conan Doyle.”
“That is wonderful,” said Sir Arthur. “With so few facts you were really able to know me.” “Of course,” said the taxi driver, “your name was on both of your traveling bags. That also helped.”
The cabman played a joke on Conan Doyle.

A: Write down whether the following statements are true (T) or false (F).

1. Sherlock Holmes is a famous writer of detective stories.
2. Once Sir Arthur Conan Doyle came to Paris.
3. The cabman recognize (узнал) him at once.
4. He could not explain why he had recognized him.
5. He knew that his passenger was a famous writer because he had seen him before.