Tiìm các số nguyên dương n , k thỏa mãn : $\frac{n}{n+50}$ > $\frac{kn^2}{kn^2+100}$

M.n giúp em với ạ! Em cảm ơn!!!!!

Tính x x . 3,65 + x . 5,55 + x = 40

em hãy viết thư cho một người thân trong gia đình để chia sẻ trải nghiệm của mình về đại dịch covid -19

làm ơn với ạ ! Gấp lắm ! em cảm ơn

.mọi người giải hộ em với ạ em đang cần kết quả gấp ạ Em cảm ơn trước ạ

mình cần đáp án đúng thì mình vote cho nhé

M.n giúp em với ạ! 3. It is possible that a child broke the window. A child … … . … … . (breake) 4.You looked at the new moon through glass. It is most unlucky that you ......(100k) 5. I've had a toothache for two days. ∼ ∼ You … … … . . … … … . . (go) to the dentist when it started. 6. As I was standing in the hall your dog bit me. ∼ ∼ It … … … … . … … … … . (not he) my dog; he was with me all day. It … … … … … . . … … … … … . . (be) my brother's 7. I feel terribly ill today. ∼ ∼ You … … … … … … … … … … (not eat) those mushrooms yesterday. Mushrooms don't agree with you.

21.She was dancing wiyh the actor. He lived near my house. 22.The bed had no mattress. I slept on that bed. 24. The woman is ascretăry. We are waiting for her. 26. I missed the train. I usually catch this train. 27. He has just gone to Mr. Lam's house. There is a party there today. 28. I saw several houses. Some of them were uncomfortable. 29. Do you remember the day? We had a class discussion on books then. 30. The tree is very tall. It stands near the gate. 31. She gave me ten books. They are very valuable. 32. I met Jane's father. He works at the university. 34. You've all met Michael Wood. He is visiting us for a couple of days. ... 35. I give her all the money. I have it. 36. We are moving to Manchester. Manchesteris in the north- west. 37. I'll be staying with Adrian. His brother is one of my closest friends.

Chứng minh $x(x-a)(x+a)(x+2a)+a^4$ là bình phương của 1 đa thức