chứng minh rằng 4n^2 - 4n + 18 chia hết 289

10 điểm giúp em với a)rút gọn : A = $\frac{\sqrt{x^2y^2}}{xy}$ + $\frac{\sqrt{(x-y)^2x^2}}{(x-y)x}$ - $\frac{\sqrt{(x-y)^2y^2}}{(x-y)y}$ b)giải phương trình : $\sqrt{(x-2013)^{10}}$ + $\sqrt{(x-2014)^{14}}$ = 1

lúc 6h sáng 1xe tải đi từ A->B sau đó 1h một xe taxi đi từ B->A hai xe gặp nhau lúc 9h sáng hôm đó. hỏi vận tốc mỗi xe bt vận tốc taxi gấp đôi xe tải bt quãng đường dài 210km

Mn lm giúp e phần đọc hiểu và phần lm văn câu 1( 200 chữ) của 2 đề này vs ạ

Rút gọn các biểu thức sau a)4√16a ² - 16a với a<0 b)3√9a ² - 9a với a>0 c) √25a ² + 6a d)x + 4 √x + 4/ √x +2

A điền câu nào đúng câu nào sai 1 phong took pari in a sports competition..................... 2 he won the first prize in a running race ................. 3 he has visited ThaiLaid....................... 4 he has seen a cartoon in Rusia........................

Mình đg cần gấp giúp mình với mình vote cho

47. Please don’t play your music so loudly. Would you mind________________________________________________ ? 48. Let’s go camping tomorrow. Why don’t_____________________________________________________ ? 49. Children shouldn’t swim in this pool because it is too deep. This pool is not_________________________________________________ 50. The house is really beautiful! What__________________________________________________________!

xác định từ loại đã học trong đoạn thơ “Chú bé loắt choắt Cái xắc xinh xinh Cái chân thoăn thoắt Cái đầu nghênh nghênh Ca lô đội lệch Mồm huýt sáo vang Như con chim chích Nhảy trên đường vàng cách làm danh từ: động từ: tính từ: đại từ: quan hệ từ:

Choose the word or phrase (a, b, c or d) that best fits the blank space in each sentence. 6. Those boys are addicted_______ computer games. a. on b. for c. to d. with 7. They will finish the work a. on b. over c. in d. out 8. The design and material used for men were different___ __those used for women. a. at b. from c. with d. in 9. We have to start early______ we won’t be late. a. so that b. because c. although d. otherwise 10. Will you buy an electric car when they_______ available? a. become b. became c. are becoming d. will become 11. Everybody must take part in________. a. protecting b. preserving c. controlling d. preventing 12. Neil Armstrong,________ first walked in the moon, lived in the USA. a. who b. that c. whom d. whose 13. Baird produced the first TV picture in 1926,_________ ? a. didn’t he b. wasn’t he c. doesn’t he d. hasn’t he 14. Traditionally, the ao dai_________ by both men and women. a. frequently wore b. was frequent worn c. worn frequently d. was frequently worn 15. We______wear helmets in order to keep the traffic law and protect ourselves. a. may b. can c. should d. need 16. She asked me if I ______ any other language. a. speak b. spoke c. can speak d. would speak 17. Internet bars mustn’t let anybody_______ bad things. a. b. to watch c. watching d. watches 18. Would you be______ to hold the door open? a. too kind b. so kind c. kind enough d. as kind 19. It’s a pity you live so far away. I wish you________ . a. lived nearer b. live near c. lived near d. live nearer 20. Tm really sorry about that!’_______ ‘_____ !’ a. That’s right b. Of course c. You’re welcome d. It’s OK