Đốt cháy hoàn toàn một lượng phot-pho trong không khí cần dùng 6.72 lít khí oxi ở điều kiện tiêu chuẩn. tính khối lượng phot-pho đã bị đốt cháy Mọi người giúp em với

giúp tớ câu 20 với, cảm ơn nhiều

Mn giúp mik với ạ Bằng các dụng cụ như: chai nhựa (chai nước lọc), giấy bạc bọc thức ăn, dây đồng (lấy từ dây điện) hãy thiết kế dụng cụ dò điện tích trên các thiết bị điện.

Giúp 1 câu a, b sẽ nhận được 60 điểm, ít lắm, kẻ bảng ra nhé

giải phương trình( 1/x*(x-1))+(2/((x-1)*(x-3))=(1/(x-3))+2

I. Complete the second sentence so that it means the same as the first. Use the word in brackets. You can’t change the word. Here is an example. 0. The bookshop is opposite the library. _________________________ a bookshop opposite the library. (THERE) Answer: 0. There is 1. How about cycling to school with me tomorrow? (CYCLE) Let’s _________________________________________. 2. What is the meaning of this road sign? (MEAN) What ___________________________________________? 3. Accident is the main cause of traffic jams in Bangkok. (CAUSED) Traffic jams in Bangkok ____________________________________________. 4. People will be fined if they don’t obey the traffic rules. (DISOBEY) People will be fined __________________________________________. 5. I spend 30 minutes walking to school every day. (TAKES) It _________________________________________.

giải phương trình( 1/x*(x-1))+(2/((x-1)*(x-3))=(1/(x-3))+2

Combine each pairs of sentences, using “both … and”, “neither … nor”, “either … or”: 11. It isn’t warm. It isn’t sunny at this time of year. ………………………………………………………………………………………………………… 12. That animal might be a fox. It might always be a young wolf. ………………………………………………………………………………………………………… 13. The front of the house needs painting. The back needs painting, too. ………………………………………………………………………………………………………… 14. Maggie knows how to prepare Chinese food. Her sister knows how to prepare Chinese food. ………………………………………………………………………………………………………… 15. George doesn’t smoke and he doesn’t drink, either. George neither ……………………………. 16. Jim is on holiday and so is Carol. Both ………………………………………………………….. 17. Jim doesn’t have a car and neither does Jane. Neither …………………………………………... 18. It was a boring film, and it was long. too. The film ……………………………………………... 19. On Friday evening, sometimes I go to the cinema, sometimes I stay home and watch TV. On Friday evening, I either ……………………………………………………………………… 20. Is that man’s name Richard ? Or it is Robert ? It’s one of two. That man’s name …………………………………………………………………………………

Tìm số nguyên x, biết: |x+2|+|5-x|=0 Mong mn giúp em ạ!

Mọi người giúp mình với. Mình cảm ơn mọi người!