Bài 1. Cho ABC vuông tại 4 có đường cao AH.a) Biết 4B = 6cm, BC = 10cm. Hãy tính độ dài các đoạn BH, CH AH, AC,b) Biết 4B V3cm. 4C → Tem. Hãy tỉnh độ dài các đoạn BC, AH, BH, CH.c) Biết BH = 16a, CH = 9a (a>0) Hãy tinh độ dài các đoạn AH, BC, AB, AC.d) Biết 48 = 154, AC=204(a>0). Hãy tinh đô dài đoạn AIBài 2. Cho A4BC vuông tại 1 có đường cao 41. Đặt BH = x(x > 0), hãy tỉnh x rồi suyra độ dài các đoạn 4/ và 4C nếu biết LB 3cm CH 320mBài 3. Cho A4BC vuông tại 4, về AH L BC tại H. Gọi HE và HF lần lượt là đường caocủa NBH và ACH. Chứng minh:a) BC²3AH² + BE² +CF².b) AH³= BC. BE.CF = BC.HE.HF

Zẽ mụt bẹn mầm mọc mụn NL:Hôm trc cj e troll e.E đg ăn cơm cj e cắt từng miếng ớt nhỏ r trộn vào,lúc đó e hổng để ý.Hnay e mọc mụn gòi hiu hiuu

BIểu cảm về lực lượng nơi tuyến đầu chống dịch covid-19

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1. The old man treated the little boy badly. a. The little boy was treated by the old man badly. b. The little boy was badly treated by the old man. c. The little boy badly was treated by the old man. d. The little boy was treated baldly by the old man. 2 They didn’t offer Ann the job. a. The job wasn't offered Ann by them. b. Ann wasn't offered them the job. c. Ann wasn't offered the job by them. d. Ann wasn't offered the job. 3 Scientists have not produced a miraculous drug which can SIDA → a miraculous drug_____ a. has not been produced by scientists which can cure SIDA. b. has not been produced by scientists who can cure SIDA. c. which can cure SIDA has not been produced by scientists. d. who can cure SIDA have not been produced by scientists. 4 The letter that I received yesterday is from my sister. a. I was received that the letter is from my sister. b. The letter that was received yesterday is from my sister. c. The letter yesterday that is from my sister is received by me. d. I received yesterday that the letter is from my sister.

Mong mn giúp mình !! Mình cần gấp ạ

Help vs ạ 50 điểm và hay nhất! II. Put the verb into the correct form. 5. I didn’t see you when you passed me in the street. If ............................................................ (I/ see) you, ............................................................ (I / say) hello. 6. Sam got to the station just in time to catch the train to the airport. If ......................................................... (he/ miss) the train ............................................................ (he / miss) his flight too. 7. I’m glad that you reminded me about Rachel’s birthday ............................................................ (I / forget) if ............................................................ (you/ not / remind) me. 8. I wanted to send you an email, but I didn’t have your email address. If ...................................................... (I/ have) your address, ............................................................ (I /send) you an email. 9. A: How was your trip? Was it good? B: It was OK, but ............................................................ (we / enjoy) it more if the weather ...................... ...................................... (be) better. 10. I took a taxi to the hotel, but the traffic was bad. ............................................................ (it / be) quicker if ......................................................................... (I/ walk). 11. I’m not tired. If ......................................................................... (I/ be) tired, I’d go home now. 12. I wasn’t tired last night. If ......................................................................... (I / be) tired. I would have gone home earlier.

đặt câu tiếng anh có because đứng đầu câu

nối giúp e ạ:) kh cần giải thích

Ai giúp mik vs ạ Mik cần gấp lắm ạ