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Bài 1: Cho tam giác ABC nhọn có góc ABC =60° đường cao AH. Đường thẳng qua C vuông góc với AC cắt đường thẳng AH tại D. Gọi E và F lần lượt là hình chiếu của H trên AC và CD. a)Nếu angle H=3cm , AC = 5 cm . Tỉnh độ dài các đoạn thẳng HC, HD, CD ? b) Chứng minh răng CF.CD=CE.CA Bài 2: Cho tam giác ABC vuông tại A, đường cao AH ( H thuộc BC) a) biết AB = 12cm, BC= 20cm. Tính AC, AH và góc ABC ( làm tròn đến độ) b) Kẻ HM vuông góc AB tại M. HN vuông góc AC tại N. Chứng minh AN. AC= AC^2 - HC^2 * GIÚP MÌNH VỚI MÌNH CẦN GẤP, SẼ VOTE 5 SAO Ạ*

Giúp em với ạ , em đang cần gấp :< Một vật nặng có khối lượng là 250kg được đặt nằm yên ở trên bàn a) Biểu diễn các lực tác dụng lên vật nặng ( cho tỉ xích tùy chọn ) b) Nếu diện tích tiếp xúc giữa vật đó và mặt bàn là 30cm$^{2}$ thì hỏi áp suất tác dung lên mặt bàn là bao nhiêu ?

ai giúp tui với tui cần gấp tui vote 5 sao

1. She gives her children everything _________ they want. A. that B. who C. whom D. what 2. The place _________ we spent our holiday was really beautiful. A. what B. who C. where D. which 3. This is an awful film. It is the worst _________ I have never seen. A. who B. that C. what D. whom 4. The hotel _________ we stayed was not clean. A. who B. that C. where D. when 5. The last time _________ I saw her, she looked very beautiful. A. who B. that C. where D. when 6. A burglar is someone ________ breaks into a house and steals things. A. that B. which C. whom D. who 7. The reason _________ I phoned him was to invite him to a party. A. what B. whose C. why D. which 8. Is there a shop near hear _________ I can buy a postcard? A. when B. which C. where D. who 9. I gave her all the money _________ I had. A. that B. what C. when D. whose 10.The party _________ we went to wasn’t very enjoyable. A. who B. when C. that D. where 11. The stories _________ Tom tells are usually very funny. A. when B. that C. where D. who 12. Have you ever seen the photographs _________ Ann took? A. that B. where C. when D. who 13. 1945 was the year _________ the second world war ended. A. which B. why C. when D. where 14. The dress didn’t fit her, so she took it back to the shop _________ she had bought it. A. where B. which C. what D. when Ex2: Fill in the blanks with “WHEN, WHERE, WHY or THAT” 1. India is the country _____________ the earthquake occurred last mont

Question 2. (TH) Tonight my younger brother will have to cook dinner ________. A. myself B. yourself C. himself D. herself Question 3. (TH) Mrs. Jackson told Tim ______ harder on his Spanish pronunciation. A. working B. to work C. works D. worked Question 4. (VD) A: “Could you help me move this table?” - B: “ ________ ” A. No. Thank you B. Sure C. Yes. I'd love to D. Yes, please

I. Rewrite the following sentences, using "Wish" 1. I don't know your name I wish............................................................................................................................ 2. I don't have Iphone. I wish............................................................................................................................. 3. Ann isn't here. I wish............................................................................................................................ 4. It is cold . I wish............................................................................................................................ 5. I live in a big city (I don't like it). I wish............................................................................................................................ 6. I can't go to the party (and I like it). I wish............................................................................................................................ 7. I have to work tomorrow (I like to stay in bed). I wish............................................................................................................................ 8. I don't get good marks. I wish............................................................................................................................ 9. I'm not lying on a beautiful sunny beach. I wish............................................................................................................................ 10. Hoa and Ba won't go fishing this weekend. They wish ..................................................................................................................... II. Change into passive : 1. People speak English in almost every corner of the world .......................................................... 2. Somebody has taken my briefcase .............................................................................. 3. She has finished the report at noon …………………………………………………………… 4.Millions of people will visit the museum. ................................................................................ 5. Our boss will sign the contract. ................................................................................ 6.They should not ask him. ................................................................................ 7. John is going to call the other members …………………………………………………………… 8. Nam is calling the other friends to help him ........................................................................................ 9.John returned the money last night ......................................................................... 10. Smoke filled the room .........................................................................

có bao nhiêu số có 3 chữ số trong đó chứa ít nhất 1 chữ số 1

Giúp mình với nhé. Mình đang cần gấp.

Question 1 . The art exhibition ______ every day except Monday. A. will open B. has opened C. opened D. opens