a) Chứng minh rằng A=100!.(1+$\frac{1}{2}$ +$\frac{1}{3}$+$\frac{1}{4}$+...+$\frac{1}{97}$ +$\frac{1}{98}$+$\frac{1}{99}$ +$\frac{1}{100}$ là sô tự nhiên chia hết cho 101. b) Tìm số tự nhiên n có 4 chữ số biết n là số chính phương và n là bội của 175

Calli: "Chuyện người con gái Nam Xương"

Bài 1: Tìm đáp án đúng 1. Do you know Janelyn? Yes, of course, I ( met / meet / is meeting ) her every day! 2. I ( am / was / were ) very happy on my last vacation. 3. Where is Tom? Ah! He ( is playing / plays / played ) football with his friends in his garden. 4. He ( doesn't / won't / didn't ) come here tomorrow. 5. ( When / Where / What time ) did you see her? - Yesterday morning. 6. We ( are visiting / will visit / visit / visited ) Ha Long Bay last summer vacation. 7. Lan sometimes ( goes / go / went / is going ) to the zoo. 8. When they ( was / will be / were / re ) children. They often played with each other. 9. Yesterday, I ( am buying / going to buy / buy / bought ) many gifts for him on the trip to HaNoi Bài 2: Sắp xếp thành câu hoàn chỉnh 1. often / I / the / museum / Saturday / visit / on 2. 3 years / my / died / ago / neighbor / because / accident / got / an / he 3. cooking / sister / in / my / is / dinner / kitchen / the 4. does not / Jane / usually / breakkfast / morning / in / the / have 5. tired / I / when / cycle / to / school / am / always / I 6. reused / recycle / we / bottles / can? 7. Anything / She / here / has been / never / she / but / buys / several times / in 8. Ever / you / been / Australia / have / in? Bài 3: Viết lại câu thành dạng phủ định và nghi vấn 1. He has been an English teacher for 20 years. 2. We are having an English test next Monday. 3. The people were friendly 4. Liz enjoyed her summer vocation last year. 5. Nam will be absent from school tomorrow. 6. She goes to the gym twice a week. 7. My brother has ever spent his summer holiday in England. Giúp mình với ạ

Cho mình hỏi na3po4 có tác dụng với na2so4 hay al(no3)3 không nếu có thì kết tủa màu gì

Giúp mình câu 1 phần tập làm văn với ạ. Nhanh giúp mình.

example In summer the day is longer and longer => It is colder and colder in winter 1, We live far , you miss you prents more 2, you run more , you fed stronger 3, the flat is big . you must pay more 4, we try more, we get more good marts 5, you are younger , you are more hand some giúp mk với mk đang cầ gấp . Mk vote 5 sao mk cảm ơn!

I really ( want ) ........... ice cream. It's hot today

a) 5km 472m = ………….km b) 2 phút 15 giây = ………. phút c) 8ha 3dam2 = …………. ha d) 5m3 14dm3 = ………….. m3 Bài 3. (1 điểm) a yx 5 1 4 3 10 7 )   b. Tìm 2 giá trị số thập phân của y sao cho: 1,5 < y < 1,6 ...................................................................................................................................

MN LÀM ƠN GIÚP EM ĐC K EM ĐANG RẤT CẦN GẤP );C

so sánh a) 3^39 và 11^21 b)199^20 và 2003^15