Câu số 3 Trắc nghiệm I/ không có đáp án

1. Ta có \(1+x^2\ge2x\), \(1+y^2\ge2y\), \(1+z^2\ge2z\)

Suy ra \(P=\frac{x}{1+x^2}+\frac{y}{1+y^2}+\frac{z}{1+z^2}\le\frac{1}{2}+\frac{1}{2}+\frac{1}{2}=\frac{3}{2}\)

Chọn D. \(P\le\frac{1}{2}\)

Tên : Lê Thị Linh Chi

Link : /vip/lethilinhchi

Cho \(x,y,z\in\left[0;2\right]\) . Tìm GTLN của biểu thức

\(P=\frac{1}{8}\left[\left(2-x\right)\left(2-y\right)\left(4-z\right)+\frac{8x}{y+z+2}+\frac{8y}{z+x+2}+\frac{8z}{x+y+2}\right]\)

1. B. TOMORROW

2. A. AMAZING

3. B. UNHAPPY

4. D. EMPTY

5. C. DIRECTORY

6. C.PARTY

7. C. AUGUST

8. A. INVITE

9. A. DELICIOUS

10. D. APARTMENT

1. ARRANGEMENT

2. INVENTION

3. COMMERCIALS

4. COMMERCE

5. COMMERCIAL 

6. EMIGRATED

7. EXHIBITION

8. EXHIBITS

9. EXPERIMENTING

10. AGREEMENT

11. DISAGREE

12. DELIVERY

13. DEAFEN

14. SPEAKING

15. SPEECH

16. SERVICE

1. In electronics, we learn to repair household appliances. HOUSE

2. Nam is very interested in computer                                      INTEREST

3. The energetic students often play soccer or basketball.  ENERGY

4. Walking in the rain gives me pleasure                                  PLEASE

5. Ba will be a famous artist one day.                                         FAME

1. Our friends (come) will come here soon

2. I usually (go) go to school by bike but tomorrow I (go) will go to school by bus

3. I (be) will be rick someday

4. They (not watch) don't watch TV everynight

5. Is Petter (play) playing soccer at the moment?

6. We (not read) won't read this lesson next Monday

7. Will she (meet) meet you soon?

8. Where will they (go) go later?

9. Mai (brush) brushes her teeth after meals.

10. What will you (do) do tonight?

The correct events : b , d , f , g