Tìm số tự nhiên nhỏ nhất n>1 sao cho A=1^2+2^2+3^2+...n^2 là 1 số chính phương

cho tam giác nhon ABC nội tiếp đường tròn tâm O , hai đường cao BB' và CC' . tia AO cắt đường tròn ở D và cắt B'C' ở I . cm : a, tứ giác BCB'C' là tứ giác nội tiếp . b, tam giác AB'C' đồng dạng với tam giác ABC . c, tứ giác B'IDC là tứ giác nội tiếp

giúp mik nha mik cảm ơn a) (-73)+(-2).7.(-5)+(-3)^3 b)-(-436)+225-625-(-564) c)(-48).75+(-75).152 d)999-{80-2.[10.(-6-23]}

NGẮN THÔI VÀ NHỚ LÀ NHÔI SAO THỂ THAO NHA , KHÔG CHÉP MẠNG NHa III. Write a short paragraph of 80 – 100 words about a sport star you like best. Suggestions: What is his or her name? Which sports does he or she play? When and how did you know him or her? What has he or she gained in his career? Why do you like him or her best

In each exercise put a suitable word in each blank space. 1. He reached there ___at__ four o'clock __in___ the afternoon __on___ Monday. 2. __On___ Tuesday I must be there ___at__ six o'clock ____in_ the evening. 3. I stopped _____ his house for a little while _____ the middle _____ a storm _on____ Sunday. 4. _____ my opinion you can rely _____ him to come _____ noon. 5. I saw him looking _____ some books __in___ the library __on___ Saturday. His brother was _____ him. 6. I posted the parcel _____ the main Post Office _____ Market Road _on____ Tuesday. 7. It won't fall _____ because I have twisted the wire _____ that post to keep it _____ position. 8. ____ Sunday I was woken up ____ the sound of the radio ____ my brother's room. It was ____ much too loudly. 9. He was injured _____ the left arm _____ the accident. 10. I was surprised _____ the way _____ which he acted. 11. The lorry was moving _____ full speed when the load fell _____ 12. We reached the city _____ about ten o'clock _____ the morning. 13. We parked our car _____ the side _____ the road. 14. There is plenty _____ tin left _____ that mine. 15. We threw the net _____ the river and sat _____ to wait. 16. There is a waterfall farther _____ the river. You can see the foam floating down _____ us. 17. Sunday is the day _____ which he goes _____ church. 18. _____ most Saturdays I go fishing _____ my brother. 19. My friend used to go to school _____ his bicycle but now he comes _____ bus or _____ taxi because he lives farther _____. 20. Some of the boxes _____ the lorry were not tied _____ firmly. 21. Sometimes I read _____ my room _____ the evening. 22. _____ the last two weeks I have spent most of my spare time _____ my hobby which is stamp-collecting. 23. You can catch plenty _____ fish _____ this method. 24. The passengers _____ the taxi were worried _____ the speed. 25. I'll see you next Sunday, that is _____ the fifth of May. 26. He turned _____ the radio and tuned _____ to BBC. 27. Some of us will be going _____ bus and some _____ our bicycles. 28. I visited my friend _____ whom I had made an appointment. 29. We arrived _____ the place _____ which we had come _____ the previous picnic. 30. I listened _____ some music _____ the radio. 31. I accompanied my uncle _____ a hunting trip _____ the jungle. 32. We camped _____ that island _____ two days. 33. When I went _____ a walk early _____ the morning, the breeze blew _____ my face. 34. We put the luggage _____ the back of the car and then set _____ _____ our journey. 35. We went to a party _____ which we enjoyed ourselves. 36. I took some photographs _____ my camera. 37. The lorry knocked _____ the back of our bus ______ accident. 38. He is interested _____ sport so when he reads the newspaper he does not bother _____ the local news except _____ the results _____football and hockey matches. 39. I called _____ Ali's house yesterday to see if he had recovered _____ his illness. He was still suffering _____ stomach-ache. 40. We ate our food _____ a shady spot and then packed everything _____ so that we were ready _____ go home.

Giúp giúp giúp plz nhanh giúp mình gấp

Tìm VB trong bài học đầu tiên cảm ơn các bạn nha

Giúp em giải thật chi tiết câu này ạ

Từ tác phẩm lặng lẽ SaPa , em hiểu điều mà người họa sĩ vẫn ao ước là gì ? Và điều gì ở anh thanh niên khiến người họa sĩ thích thú

Bài 2: Theo em, nhân vật Dế Mèn có điểm nào đáng yêu mà em cần học hỏi và những điểm nào là hạn chế mà Dế Mèn phải khắc phục? Bài 3: Hình ảnh sông nước Cà Mau và chợ Năm Căn có nét gì độc đáo khác hẳn với các vùng đất khác của cả nước?