Tìm tất cả các số nguyên n sao cho n² + 2022 là một số chính phương.

Chứng minh rằng: \(\left(x+y+z\right)^2\le3\left(x^2+y^2+z^2\right)\)

Giúp mk với a QAQ

Theo em, tại sao nói giảm phân I mới là giảm phân thực sự, còn giảm phân II giống nguyên phân.

Theo em, những hoạt động nào của NST trong nguyên phân tạo nên bộ NST của tế bào con giống nhau và giống tế bào mẹ.

Viết G của các cơ thể sau: Aa, AaBb, BbddEE, BBDDEe.

GIÚP MK VS< MAI KTRA RỒI QAQ

Cho a, b, c là ba số thực không âm thỏa mãn \(a+b+c=\sqrt{a}+\sqrt{b}+\sqrt{c}=2\)

Chứng minh rằng: \(\frac{\sqrt{a}}{1+a}+\frac{\sqrt{b}}{1+b}+\frac{\sqrt{c}}{1+c}=\frac{2}{\sqrt{\left(1+a\right)\left(1+b\right)\left(1+c\right)}}\)

GIÚP MÌNH VỚI!!!! QAQ

1. The Singaporean unit of …..is dollar. (length/ height/ volum/ currency

2. Buddhism is the official …..of Thai land. (region/ religion/ language/ capital)

3. Lan na Marie are penpals. They …….at least once every two months. (write/ correspond/ exchange/ visit)

4. A friend with whom one becomes friendly by corresponding is a ….(writer/ pen-name/ pen-friend/ pen-writer)

5. They really enjoy the peaceful ………..in Viet Nam. (impression/ atmosphere/ faces/ expression)

6. Is physical education ………in your school? (additional/ national/ traditional/ compulsory)

7. The ….language of Malaysia is Bahasa Malaysia. (national/ international/ country/ continental)

8. Malaysia divided into two ……., known as West Malaysia and East Malaysia. (religion/ religious/ relation/ relative)

9. I have a penpals in Malaysia . We ……each other at least once a month. (comprise/ consist of/ divide/ correspond with)

10. The children were ……into four groups for the game. (separated/ separating/ separate/ to separate)

11. She was really impressed ……the friendliness do the local people. (with/ by/ in/ on )

11. I wish I ….more time to finish the work. (have/ am having/ was having/ had)

12. He seems ….the Vietnamese food. (enjoying/ to enjoy/ be enjoyed/ enjoyed)

13. This smart dictionary…..100,000 words. (makes/ uses/ comprises/ consists)

14. The book …. Ten units. (comprises/ consists/ makes/ has)

15. Islamic people usually go to the ….to pray. (pagoda/ mosque/ temple/ church)

16. It’s raining heavily now. I wish …….the answer. (know/ knew/ had known/ would know)

17. when I was the grade primary school, my grandmother …me to school everyday. (takes/ is taking/ used to take/ was taking)

18. I wish I earned more money, but in fact I …… (don’t/ did/ was/ didn’t)

19. “Have you ever been to Ha Noi, Lan?” “Yes, I …..there last summer. (was/ were/ have been/ has been)

20. He never drinks beer, He …..drinking beer. (used/ isn’t used to/ used to/ isn’t used for)

21. Wear a helmet when riding a bicycle. Helmets are used ……our head. (to protect/ protect/ protecting/ protected)

Nowadays, Internet has become an important part in the modern life. Besides the advantages, it also brings about many disadvantages that no one expects. First, Internet is so addictive and time-consuming. Using it sometimes makes you lose your sense of time and easily deep in meaningless things. For example, when you start studying at 7 o’clock, you have intention of using Internet for doing homework but then you are addicted to the entertainment websites and can not stop. As a result, it takes you a lot of time to finish work and makes you lazier and lazier. Second, some social networking sites contain potential risks, because they are not strictly controlled. Some websites can report the false and reactionary information, other ones even can take advantage of your belief then make money illegally. Last but not least, Internet affects harmfully to your health. It is undeniable fact that your vision is shorten so much when you use smartphone or computer so much. Moreover, it also results in some diseases, which relate to memory and skeleton, especially promote the senescence faster. Taking into consideration, Internet is not bad but everyone should uses it reasonably and effectively.