giup vs nm ....................

2. Tại sao người ta thường bỏ cốc vào nồi luộc sôi trong một thời gian rồi mới đem ra dùng? 3. Vì sao vào mùa hè dây điện thoại thường bị võng xuống còn vào mùa đông lại không có hiện tượng đó ? Giúp mình câu 2 và 3 nhanh nha

nhân dân ta đã có câu tục ngữ thương người như thể thương thân a, biện pháp tu từ nào được sử dụng trong câu trên b,nêu tác dụng của tu từ đó

giải cho mình câu này với ạ. đang cần gấp tìm giới hạn lim (1/(-x^2+x+2) -2/(x^3+1) khi x->(-1)^-

giúp vs nm ................ nhanh nha

: Cho phân số 2 phần 11 . Hỏi phải cộng thêm vào tử số và mẫu số của phân số đó một số tự nhiên là bao nhiêu để được một phân số mới có giá trị bằng 4 phần 7 ?

Giups mình zới --Vote 5 sao và bình chọn cho câu trả lời hay nhất nè--- 1)There __________ 54 ethnic minorities in Viet Nam. A. is B. are C. was D. were 2)Robert ________ tomorrow morning on the 10:30 train. A. arrived B. is arriving C. has arrived D. would arrive 3)I will come and see you before I _________ for America. A. leave B. will leave C. have left D. shall leave 4) I __________ along the road when I saw Dave, so I stopped and we had a chat. A. walked B. am walking C. was walking D. walk 5) This time last year, I ____________ in France. A. was living B. am living C. lived D. had lived 6) He _______ in the bank for five years. A. had worked B. has worked C. worked D. works 7) Angelina Jolie is a famous actress. She ________ in several film. A. appears B. is appearing C. appeared D. has appeared 8) We________ this course before the final examination. A. are going to finish B. have finished C. will finish D. finished 9) While I ________ cakes, my sister ________ her homework. A. was eating/ did B. ate/ did C. ate/ was doing D. was eating/ was doing 10) She __________ in the library last night. A. had studied B. has studied C. studied D. studies 11) My teacher often ________ to work by bus in the afternoon. A. is working B. worked C. will work D. works 12) Look! The bus _____________ . A. left B. has left C. leaves D. is leaving 13) “Would you like something to eat?” - “ No, thank you. I __________ lunch.” A. have just had B. just have had C. had just had D. just had had 14)I think she ________ as soom as she knows the news. A. leaves B. is going to leave C. will leave D. had left 15) Mr. Smith _______ with his cast in the studio at the moment. A. works B. is working C. worked D. has worked 16) He has been selling motorcycles ____________. A. ten years ago B. for ten years C. for ten years ago D. since ten years 17) “Why are you turning on the television?” - “ I __________ the news.” A. watch B. will watch C. am going to watch D. watched 18) While her husband was in the army, Janet________ to him twice a week. A. was writing B. wrote C. was written D. had written 19) He will take the dog out for a walk as soon as he ________ dinner. A. finishes B. finish C. will finish D. is finishing 20) The Olympic Games ________ every four years. A. take place B. takes place C. took place D. is taking place 21) After I _____ my colors, I ______ to paint. A. had mixed/ started B. mixed/ had started C. mixed/ started D. had mixed/ had started 22) What time________ the next train leave? A. does B. will C. shall D. would 23) The art exhibition ______ on 3 May and ______ on 15 July. A. opened/ finished B. will open/ will finish C. opens/ finishes D. open/ finish 24) George ________ off the ladder while he was painting the ceiling. A. falls B. fell C. has fallen D. was falling 25) I ________ anything yesterday because I __________ hungry. A. don’t eat/ don’t feel B. haven’t eaten/ haven’t felt C. didn’t eat/ didn’t feel D. hadn’t eaten/ hadn’t felt 26) My friend _________ to see me yesterday. C. has come B. came D. will come A. comes 27) The Perfume River __________ through Hue City. A. flow B. flew C. is flowing D. flows 28)They __________ in a few minutes. A. arrive B. are going to arrive C. will arrive D. are arriving 29) Mai and Lan _______ pen pals for over two years. A. has been B. have been C. has known D. have known 30) Look! It __________ at present. A. rains B. is raining C. will rain D. rained

Cho tam giác ABC với AB = AC.Vẽ AH  BC ( H  BC ) a) Chứng minh rằng HB = HC. Tính AH. b) Trên tia đối của tia BC lấy điểm D, trên tia đối của tia CB lấy điểm E sao cho BD = AB; CE = AC. Chỉ ra các tam giác cân trong hình?

Giải hộ mình ạ VẼ HÌNH ĐẦY ĐỦ NHA

Giải cho e vs ạ Pt chứa ẩn ở mẫu