Help em với Khi viết một số tự nhiên có hai chữ số mà chữ số hàng chục lớn hơn chữ số hàng đơn vị là 4, ta viết được (A) 3 số (B) 4 số (C) 5 số (D) 6 số

Giúp mình với !!!!!!!!!!!!!!!!!!!!!!!!!!!

Giúp e với anh chị em cảm ơn nhiều akkkk

Ex6: Tick  to right sentences and correct wrong sentences. Sentence Correction 1. Can he understand what you were talking about? _____________________ 2. Now I’m a little busy but I will be able to spend time with you tomorrow. _____________________ 3. Will people be able to live forever one day? _____________________ 4. My brother cannot cook very well. He is a chef in a famous French restaurant. _____________________ 5. When I was very young, I could not touch my shoes. But I can’t now. _____________________ 6. Despite the arrival of the storm, they will be able to finish the football match. _____________________ 7. My grandfather was one of the most famous musicians of his time. He could play the piano like a professional. _____________________ 8. I hope that I won’t be able to speak English fluently after this course finishes. _____________________ 9. When my friend Nana was only 2 years old, she could speak mother tongue quite well. _____________________ 10. Will you be able to work this weekend? There is going to be a new project to work on.

Rút gọn P=($\frac{2√x+x}{x√x-1}$ -$\frac{1}{√x-1}$ ):(1-$\frac{√x+2}{x+√x+1}$ )

Bài 2: Chọn đáp án đúng nhất 1. When I last saw him, he _____ in London. A. has lived B. is living C. was living D. has been living 2. We _______ Dorothy since last Saturday. A. don't see B. haven't seen C. didn't see D. hadn't seen 3. The train ______ half an hour ago. A. has been leaving B. left C. has left D. had left 4. Jack ______ the door. A. has just painted B. paint C. will have painted D. painting 5. My sister ________ for you since yesterday. A. is looking B. was looking C. has been looking D. looked 6. I ______ Texas State University now. A. am attending B. attend C. was attending D. attended 7. He has been selling motorbikes ________. A. ten years ago B. since ten years C. for ten years ago D. for ten years 8. Christopher Columbus _______ American more than 500 years ago. A. discovered B. has discovered C. had discovered D. had been discovering 9. He fell down when he ______ towards the church. A. run B. runs C. was running D. had run 10. We _______ there when our father died. A. still lived B. lived still C. was still lived D. was still living 11. They ______ table tennis when their father comes back home. A. will play B. will be playing C. play D. would play 12. By Christmas, I _______ for Mr. Smith for six years. A. will have been working B. will work C. have been working D. will be working 13. I _______ in the room right now. A. am being B. was being C. have been being D. am 14. I ______ to New York three times this year. A. have been B. was C. were D. had been 15. I'll come and see you before I _______ for the States. A. leave B. will leave C. have left D. shall leave 16. The little girl asked what _______ to her friend. A. has happened B. happened C. had happened D. would have been happened 17. John ______ a book when I saw him. A. is reading B. read C. was reading D. reading 18. He said he _______ return later. A. will B. would C. can D. would be 19. Jack ________ the door. A. has just opened B. open C. have opened D. opening 20. I have been waiting for you ______. A. since early morning B. since 9 a. m C. for two hours D. All are correct 21. Almost everyone _______ for home by the time we arrived. A. leave B. left C. leaves D. had left 22. By the age of 25, he ______ two famous novels. A. wrote B. writes C. has written D. had written 23. When her husband was in the army, Mary ______ to him twice a week. A. was reading B. wrote C. was written D. had written 24. I couldn't cut the grass because the lawn mower ______ a few days previously. A. broke down B. has been broken C. had broken down D. breaks down 25. I have never played badminton before. This is the first time I _____ to play. A. try B. tried C. have tried D. am trying 26. Since _______, I have heard nothing from him. A. he had left B. he left C. he has left D. he was left 27. After I _______ lunch, I looked for my bag. A. had B. had had C. have has D. have had 28. By the end of next year, George _______ English for two years. A. will have learned B. will learn C. has learned D. would learn 29. The man got out of the car, ________ round to the back and opened the book. A. walking B. walked C. walks D. walk 30. Henry _______ into the restaurant when the writer was having dinner. A. was going B. went C. has gone D. did go hơi nhiều nhưng làm đúng giúp tôi nhé!

Máy tính cầm tay của tôi hiệu Casio phiên bản mới nhất, màn hình tự nhiên màu xanh lè( xanh biển á) nhìn đối diện thì không thấy số rõ nhưng nhìn từ dưới lên trên thì có rõ nhưng không rõ lắm. Cho hỏi là bị gì vậy ạ.

Nào các cao nhân giúp tôi đi :))) ghi đáp án và giải thích nhé :))

Cho tứ giác ABCD có AD=BC.Đường thẳng đi qua trung điểm M và N của AB và CD cắt AD và BC lần lượt tại P và Q.Chứng mình góc APM bằng góc BQM

Rút gọn P=($\frac{x+2}{x√x-1}$ +$\frac{√x}{x+√x+1}$ +$\frac{1}{1-√x}$): $\frac{√x-1}{2}$