Cho tứ giác ABCD. M,N là trung điểm các cạnh AB,CD. O là trung điểm của MN. Gọi d là một đường thẳng bất kì không cắt các cạnh của tứ giác. Chứng minh rằng tổng độ dài ba đường vuông góc hạ từ A,B,C,D xuống d bằng 4 lần độ dài đường vuông góc hạ từ O xuống d

hoàn thành sơ đồ pứ sau: `Zn->ZnCl_2->Zn(OH)_2->Na(ZnO_2)_2`

Hỗn hợp Na và K tác dụng hết với H2O cho 22,4 lít khí h2 (dktc) và dung dịch B. Trung hòa dd B bằng dd HCl 0,5M rồi cô cạn dd thu được 13,3g muối khan a)Tính thể tích dd HCl đã dùng b) Tính %m mỗi kim loại

Giúp mình bài này với, mk cần gấppp

giúp mình với chỉ cần đáp án không cần giải thích gì thêm Lưu ý : mình không chụp thiếu đề và cũng không sai đề

CMR : dien tich cua 1 tam giac bang mot nua tich cua hai canh voi sin cua goc nhon tao boi hai duong thang chua hai canh ay . CAM ON SAU SAC !

Diễn một mạo từ thích hợp vào chỗ trống nếu cần thiết. 1.My friend is angry with me because I can’t remember _______ exact date other birthday. 2. _______ Christmas is one of _______ important holidays in _______ Western countries. 3. _______ Ho Chi Minh City is one of _______ biggest cities in _______ Vietnam. 4. “Are Kate and David _______ siblings. They look alike.” “No, they aren’t They are _______ cousins”. 5. Yesterday _______ fog was so thick that we couldn’t see clearly. We followed _______ car in front of us and hoped that we were going _______ right way. 6. My father has bought me _______ computer.Thanks to it, I can learn many things from______ Internet. I think _______ computer is one of _______ greatest inventions of all time. 7. _______ Great Lakes, also called _______ Laurentian Great Lakes and _______ Great Lakes of North America, are _______ series of interconnected freshwater lakes. 8. ______ Pacific Ocean is _______ largest and deepest of Earth’s oceanic divisions. It extends from Arctic Ocean in ______ north to ______ Southern Ocean in _____ south. It is bounded by _______ Asia and _______ Australia in _______ west and _______ US in _______ east. 9. When I was _______ student, I lived with _______ American couple in _______ home stay in Texas. Both _______ host and _______ hostess were friendly and helpful. 10. Last year, Peter paid _______ visit to _______ England on early April. He had the chance to enjoy _______ University Boat Race (between Oxford and Cambridge), which took place on _______ Thames. _______ Thames is _______ historic heartland of rowing in _______ United Kingdom.

có gửi cả hình nha. đúng tick 5 sao

Write the correct form of the word in brackets 1. The Internet is very_addicted_ _____, it takes up a lot of our time. (ADDICT) 2. Face to face _____ is better than Skype video calls (COMMUNICATE) 3. Sitting in front of the computer too long can cause _____. (OBESE) 4. The Internet has changed the English language _______. (CONSIDER) 5. She was ______ with her job and decided to look for a new one. (SATISFY)

7.Other oceans in the world aren’t as large as the Pacific one. → The Pacific Ocean is ______ 8.This is the most delicious cake I’ve ever tasted. –> I’ve………………………….. 9.I’ve never met any more dependable person than George. –> George is………………………… 10.There isn’t anybody as kind-hearted as your mother. –> Your mother is …………………… 11.There is no better teacher in this school than Mr John. –> Mr John is…………………………….. 12. Have you got any bigger than that one? –> Is this………………………………...? *1. My friends spent more time on playing volleyball than than I did. ( less) àI….…… 2. New York has more billionaires than Tokyo.-> Tokyo …………… 3. We will use less electricity in the futureà Less electricity ………………….… 4.I have more books than HoaàHoa has………………………. 5.January has more days than February->February................................................................. 6. My friends spent more time on playing volleyball than than I did. ( less) àI….……… 7. New York has more billionaires than Tokyo. -> Tokyo has fewer ........................ 8. A healthy child needs less care than a sick one. → A sick child………… 9. A teacher needs more calories than a farmer.(fewer)-> A farmer ................ viết lại câu nha mấy bạn