f(x) = x⁵ - x - x + 2

chứng minh đa thức trên không có nghiệm

Cho ΔABC cân tại A có phân giác BD của góc B. DH ⊥ BC. Gọi K là giao điểm BA và HD. C/m

a, BD ⊥ KC

b, ∠DKC = ∠DCK

c, 2(AD + AK) > KC

Tìm nghiệm của đa thức sau:

B(x) = (16 - 4x) . (2x +2)

Tính nhanh: 23\(\frac{1}{4}\).\(\frac{7}{5}\)-13\(\frac{1}{4}\).\(\frac{5}{7}\)

Đánh giá những công lao của quang trung trong công cuộc đâu tranh chống giặc ngoại xâm nội phản và trong quá trình xây dựng đất nước.

1, They shouted at her (angry) _________

2, He drove very (fast) __________ so he had a terrible accident.

3, You shouldn't work (hard) __________ all day.

4, He answered (different) __________ from you.

5, She looked at the dress (care) _________

6, They are very (friend) _________

7, No one can play the game (good) ________ like him.

8, They argeed with you on the plan . They smiled ( happy) ________

9, SHe (rare) ________ go home late at night.

I. Pronounced

A. means

B. physics

C. indoors

D. score

II. Stress

1. A. apartment

B. family

C. expensive

D. eleven

2. A. number

B. student

C. parents

D. complain

3. A. celebration

B. collection

C. entertainment

D. education

4. A. chemistry

B. biology

C. physics

D. history

5. A. television

B. communication

C. examinitation

D. qualification

1. The crowd became increasingly angry at the long delay.

______________the delay (was),____________ the crowd became.

2. The value of a picture depends on how late I go to bed.

_____________an artist (is)___________the picture is.

3. How well I sleep depends on how late I go tobd

______________I go to bed,______________I sleep.

4. I don't spend much time with my family because I work so hard.

______________ I work,______________ I spend with my family.

5. The traffic moves very slowly as more cars comes into the city.

______________cars come into the city,_________ the traffic moves.

6. How much you sweat deoends on how hot you get.

______________you get,______________you sweat.

7. Its's hard to concentrate when you are tired.

______________you are,______________it is to cut something.

8. How much petrol a car uses depends on how big the engine is.

_____________the engine (is)_____________the car uses.

9. if a knife is sharp, it is easy to cut something with.

____________ aaa kinfe (is)___________ it is to cut something.

10. I became increasingly nervous about her fast driving.

___________she drove,______________ I became.

I. Complete the sentences below, using the information in brackets.

1. The older you get,________________________ (you are understanding)

2. The younger you are,________________________(you learn quickly)

3. The earlier we start,____________________(it is good)

4. The bigger a supermarket is,_________________(the choice is wide)

5. The more you learn,_________________(you know a lot about the world)

6. The more we practice a language,_____________(we can speak fluently)

7. The more he plays sport,__________________(he looks healthy)

8. The higher the humidity is,_____________(people feel uncomfortable)