Tìm GTNN GTLN của P=(x^2+1)/x^2-x+1

Thực hiện giao thoa ánh sang với khe dân a=1,5mm D=3m dung ánh sang có bước sóng λ= 0,4μm a)tính khoảng vân, xác định vị trí vân sang vân tối bậc 5 trên màng b)ở tọa đô x=3,2mm thì là vân sang hay tối thứ mấy c)biết bề rộng giao thoa trên màng là 40mm tính số vân sang tối thấy đc trên màng d) dùng đồng thời 2 bức xạ λ trên và λ’=0,6μ. Xác định khoảng cách ngắn nhất giữa 2 vân sáng có màu giống vs màu vân sáng trung tâm

bài 3 ; một hình trụ có thể tích là 20 bi dm^3 , chiều cao bàng 5 dm . tính diện tích toàn phần của hình trụ đó. bài 4 : cho hcn ABCD có AB =4cm , BC= 5cm /Quay hình chữ nhật đó 1 vòng quanh cạnh AB đc một hình trụ .tính thể tích hình trụ

Vẽ đậu mầm ạ 60₫ của toii á vẽ đẹp dzô.-.

Giải hộ em bào 7 và bài 8 với ạ

Giúp mik vẽ sơ đồ tư duy môn vật lý chương 2 điện từ học của lớp 9 nha ! Cảm ơn

Dựa vào cách tả dòng sông Thu Bồn trong đoạn trích em hãy viết đoạn văn từ 5 đến 6 câu miêu tả dòng sông quê hương em

Cho hàm số y =-2x +1 nếu x=3 thì y bằng

giúp mik vs ạ mik đang cần gấp cảm ơn nhiều lắm ạ

1. Can you turn _______________ the light? It’s so dark. (on/off/in/for) 2. What are you looking ______________? My picture book. I’ve lost it. (in/at/ for/off) 3. There are____________ saving methods and inventions to use solar energy. (energetic/energize/energy/energetics) 4. A new air-conditioner will be __________ this morning. (to install/installed/installing/install) 5. I suggest you _______________ to the hospital. (should going/going/should go/to go) 6. He is one of the most famous _______(environment/ environmental/ environmentalists/ environmentalist) 7. Who looks _____________ your children when you are away from home? (after/in/into/for) 8. You must reduce the ____________of water your family uses. (number/amount/many/ much) 9. _________________ is a person who repairs electrical equipment. (plumber/electrician/carpenter/conservationist) 10. It’s raining heavily ________________ I can’t go out. (so/as/but/and) 11. She is worried ____________ her recent water bill. (with/about/as/for) 12. Energy saving bulbs should be used to save ___________ (electric/ electricity/ electrical/ electrician) 13. Solar energy doesn’t cause ______________. (pollution/ polluter/ pollutant/ pollute) 14. A __________ faucet can waste 500 liters of water a month. (dripped/drips/drop/dripping) 15. Ba missed the Math test yesterday. ______________ he will have to do it next week. (Moreover/However/Therefore/And) 16. If _______________were inexpensive and unlimited, many things in the world would be different. (pollution/standard/energy/sewage) 17. A _____________ is a person who installs and repairs water pipes. (plumber/electrician/carpenter/conservationist) 18. A lot of countries in the world are already using ________________ energy. (solar/sun/nuclear/efficiency) 19. Electricity, gas and water are ________________. (luxuries/appliances/necessities/ resources) 20. How about ________________ poster on energy saving and hanging them around our school. (making/make/should make/to make) 21. Remember to turn _____________ the faucet after use. (off/on/up/down) 22. I can’t hear what you’re saying. Can you turn ___________ the radio? (up/down/on/off) 23. Ba is pleased ____________ his English is improving day by day. (that/so/but/therefore) 24. If we go on littering, the environment will become seriously ________ (polluted/ unpolluted/ pollution/polluter) 25. The air in the city is very ____________. (polluted/pollution/ polluter/ pollutant) 26. Turn _____________ the music. It’s too loud. (on/off/in/down) 27. The washing machine was expensive ____________ we couldn’t afford to buy it. (so/but/however/because) 28. He didn’t have much money, ____________ he bought a lot of things at the shop for Tet. (but/or/and/so) 29. The doctor suggested that the secretary _______at least three days off work .(to have/having/should have/has) 30. She suggested __________ for a swim. (going/go/to go/ gone) 31. In winter, heating _________ for 50 percent of our electricity bill. (takes/occupies/accounts/costs) 32. Energy can be collected by solar __________ on cloudy days. (boards/panels/bars/sheets) 33. If we don’t find ______________________ sources of power, we will use up all the fossil fuels in the near future. (effective/efficient/natural/alternative) 34. Are wind power ___________ solar power new kinds of energy for future use? (and/or/with/but) 35. Lan suggested ________to the zoo at weekend. (to go/going/went/to go) 36. Shall we clean up the kitchen, Mum ? ________ (Yes, we do./O.K/No, we don’t./Yes, let’s.) 37. It‘s so hot . Why don’t we go swimming ? ________ (Yes, we do/No, we don’t ./That’s a good idea./Yes, thanks.) 38. Let’s go somewhere for a drink________ (All right./Yes, we do./No, we don’t./No, thanks.) 39. This movie is not interesting . How about ________ to the concert. (to go/going /go/went) 40. You don’t like English food. What about ________Chinese food? (to eat/eat/eating/ate) 41. I think we should ________ up our neighborhood. (to clean/clean/cleaning /cleaned) 42. Our teacher suggests ________a meeting to discuss about the solution to keep our environment clean. (to hold/hold/holding/held) 43. Her former leader suggests that she ________ harder to break her past records. (to train/train/training/trained) 44. The children volunteer to clean up the local park ________ there are lot of used cans and trash there. (but/because/and/so) 45. The “Green Sunday” was short: ________, the students enjoyed it very much. (but/because/however/although)