Предмет: Математика, автор: Аноним

Не решая квадратного уравнения 3x^2-5x+11 составьте уравнение с целыми коэффициентами, каждый корень которого на две единицы меньше корня данного уравнения

Ответы

Автор ответа: Санечка69
0
по теореме Виета для квадратного уравнения ax² +bx +c = 0 верно:
х1 + х2 = -b/a, х1 · х2 = с/а.
в нашем уравнении х1 + х2 = 5/3, х1 · х2 = 11/3
а в новом - каждый из корней на 1 меньше, тогда сумма новых корней будет (х1 - 2) + (х2 - 2)  = 5/3 - 4 = -7/3;
а произведение новых корней будет
(х1 - 2)(х2 - 2) = х1 · х2 - 2х1 -2 х2 +4 = х1 · х2 -2 (х1 + х2) + 4 = 11/3 - 10/3 + 4 = 1/3 + 4 = 13/ 3.
Имеем: b/a = -7/3, с/а = 13/3, по теореме, обратной теореме Виета, получим уравнение х² + (-7/3)х + 13/3 = 0 или 3х² - 7х + 13 = 0.
Автор ответа: Аноним
0
только не на одну а на две ну всё равно спасибо
Автор ответа: Санечка69
0
прости, пожалуйста, сейчас пересчитаю
Похожие вопросы
Предмет: Английский язык, автор: nursatrym
A rich man once asked a great painter to paint a small picture for him. Next day the painter came and brought him the small picture.“In is a beautiful picture”, said the rich man. “How much do you want for it?”

“One thousand dollars,” answered the painter.

“One thousand dollars for such a small picture?” cried the rich man. “You painted it in one day and you want one thousand dollars for one day’s work?”

“Yes, I painted it in one day, but I worked thirty years in order to learn how to paint it in one day,” answered the painter.

I. Find the correct word:

1. A rich man asked a great painter to paint ….

a) a small picture b) a dog c) his friend

2. Next day the painter brought him …

a) money b) the picture c) many nice pictures

3. The price of the picture was … thousand dollars.

a) 10 b) 5 c) 1

4. The rich man cried that the picture was …

a) expensive b) cheap c) bad

5. The painter worked … years in order to learn how to paint in one day.

a) 50 b) 30 c) 10

II. right and wrong statements:

1. A rich man asked his friend to paint a small picture.

2. In a year the painter brought him the picture.

3. The rich man liked the picture.

4. The painter said that he wanted 1 thousand dollars for the picture.

5. The painter painted the picture in one day.

6. The rich man gave the painter 1 thousand dollars.

7. The painter worked 30 years in order to learn how to paint a picture in one day.

What is the main idea of the story? пж ответ барма пж пж пж ответ барма ​