Ai rảnh giải gấp giúp mình với ạ cảm ơn

So sánh a=1/2+1/6+1/12+1/20+1/30+...+1/90

Bảng 1 cho biết độ tăng thể tích của 1 000 cm khối một số chất lỏng khi nhiệt độ tăng lên 50 độ c . Khi nhúng ba bình thủy tinh giống nhau chứa ba chất trên trong cùng một chậu nước nóng bình nào mực chất lỏng thấp nhất ?

giải hộ e bài này vs ạ ............

1. He spent lots of time doing this experiment. ………………………………………………………………………………………….. 2. It took me all the morning to prepare for lunch. ………………………………………………………………………………………….. 3. Anna spent three days visiting VN. ………………………………………………………………………………………….. 4. It took my son three years to study in this college. ………………………………………………………………………………………….. 5. I spend two hours doing my homework everyday. ………………………………………………………………………………………….. 6. They spent ten days painting this house. ………………………………………………………………………………………….. 7. She spent 2 days tidying her room. ………………………………………………………………………………………….. 8. We used to go to school in half an hour. ………………………………………………………………………………………….. ………………………………………………………………………………………….. 9. My sister often spends 30 minutes reviewing our lesson before class. ………………………………………………………………………………………….. 10. It took him twelve hours to fly from Hanoi to London. ………………………………………………………………………………………….. 11. It takes Jill 10 minutes to put on her makeup. ………………………………………………………………………………………….. 12. It took us three days to repair his car. ………………………………………………………………………………………….. 13. I will spend two weeks reading the new book. ………………………………………………………………………………………….. 14. A good chef spent an hour cooking this meal. ………………………………………………………………………………………….. 15. The flight to New York lasted six hours. ………………………………………………………………………………………….. Answer the following questions 16. How often do you go to the gym? (sometimes) ………………………………………………………………………………………….. 17. How often does the boy study in the library? (rarely) ………………………………………………………………………………………….. 18. How often did you get presents when you were a child? (frequently) ………………………………………………………………………………………….. 19. How often were you absent from your previous job? (never) ………………………………………………………………………………………….. 20. How often does she go to the dentist? (every month) …………………………………………………………………………………………..

cali: ngu tiếng anh app nha, màu gì cx đc NL: đã học ngu , bị thầy ghim rồi mà lỡ dậy muộn 5 phút rồi thầy ko cho vào học nx huhuhuhu. có ai ngu tiếng anh như tôi ko

giúp mik với ạ hứa sẽ đánh giá 5 sao ạ ai nhanh nhất sẽ để câu trả lời hay ạ

1.phân tích thành nhân tử: a, 1/4 a ²-b ² b, 49-a^4b ² c, a ²x ²-1/4 b ² d, a^4-b^4 e 4p ²-9 f, c ²d^4 g, 81a ²b ²-9x ² h, (5a+3b) ²-25 i, (a+3y) ²-z ² k, a ²b-b ³(x+y) ² m, (xy) ²-(x-y) ² n, 1-(x-y) ² l, 16a ²-(x-y) ² p, (a-3b) ²-16c ² q, 9a ²+6ab+b ² u 1-a ³ v, 64x ³+1/8 w, a ³-27 y, x ³-3x ²+3x-1

1. The plane …………………………… (leave) Buenos Aires at midnight last night. 2. Helen …………………………… (bring) her cousin to the party yesterday? 3. The sun …………………………… (rise) in the east. 4. ……………. children ……………… (often / love) to play with sand? 5. I…………………………… (go) to school late because the clock didn't go off. 6. In the past, farmers mainly…………………………… (plough) with a buffalo. 7. Although they have to work hard in the field, they still ………………… (live) happily. 8. He …………………………… (write) that novel in 1989. 9. It was warm, so I…………………………… (take) off my coat. 10. George says he’s 80 years old, but nobody…………………………… (believe) him. 11. Water …………………………… (boil) at 100 degrees Celsius. 12. The film wasn't very good. I …………………………… (not enjoy) it very much. 13. I knew Sarah was very busy, so I …………………………… (not disturb) her. 14. He …………………………… (have) a new haircut today. 15. I …………………………… (usually / have) breakfast at 6.30. 16. Peter …………………………… (not/ study) very hard. He never gets high scores. 17. My mother …………………………… (often / teach) me English on Saturday evenings. 18. I like Math and she …………………………… (like) Literature. 19. …………….. your sister …………….. (wash) the dishes every day? 20. They …………………………… (not/ have) breakfast every morning.

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