Построить прямые у=2х-3 и у=3х-2. найти графически точку пересечения этих прямых

ответ:[1;2]

Объяснение:

2х^2-6х+4≤0

Если графически решать данной неравенство то

y=2х^2-6х+4-это парабола ветви которой направлены вверх

y=0 - это ось Ох

Решением этого неравенства является область х в которой парабола лежит ниже

или касается в одной точке оси Ох

Но это возможно при D>=0 (а решением является отрезок [x1;x2])

Если D<0 решения нет и нет точек пересечения параболой оси Ох

Найдем D

D=36-32=4

x1=(6-2)/4=1

x2=(6+2)/4=2

Где х1 и х2- точки где парабола пересекает ось Ох

или 2х^2-6х+4 =0

2х^2-6х+4=2(x-1)(x-2)

Перепишем неравенство

2(x-1)(x-2)<=0

Тут можно решать любым методом

Решим методом интервалов.

Методом подстановки находим знаки левой части неравенства

  +    0   -    0  +.

!!

        1       2.

Видно что левая часть неравенства меньше нуля в области

где х принадлежит [1;2]

ответ:[1;2]

Unit 4 Eating Out

Match the words in A with its explanation in B

1.a quality a) no good

2. abundant b) large quantities

3. customary c) to add to a dish to make it look

attractive

4. distinctive d) how good or bad something is

5. to garnish e) quickly

6.interior f) usual

7. inferior g) inside of building

8. relatively h) usual

9. rapidly i)comparatively

II. Complete the sentences with the above words:

1. design is the art of planning the decoration of the inside a house or an

office

4. These shoes are f good .

5. She made progess and was soon the best in the class.

6. thedi with parsley and serve!

7. We look a supply of food with us when we went hiking in the

mountains

8. He’s a good tennis player.

9. This sauce has a very taste.

Объяснение: Unit 4 Eating Out

Match the words in A with its explanation in B

1.a quality a) no good

2. abundant b) large quantities

3. customary c) to add to a dish to make it look

attractive

4. distinctive d) how good or bad something is

5. to garnish e) quickly

6.interior f) usual

7. inferior g) inside of building

8. relatively h) usual

9. rapidly i)comparatively

II. Complete the sentences with the above words:

1. design is the art of planning the decoration of the inside a house or an

office.

2. It’s to hold the door open for someone who is entering a building

behind you.

3. They were very upset. They had bought goods of quality.

4. These shoes are of good .

5. She made progress and was soon the best in the class.

6. the dish with parsley and serve!

7. We look an supply of food with us when we went hiking in the

mountains.

8. He’s a good tennis player.

9. This sauce has a very taste.