Bài toán 1. Cho tam giác BFC cân tại B. Kẻ FE 1 BC tại E, CA 1 BF tại A. a) Chứng minh ABEF = ABAC. b) FE cắt CA tại D. Chứng minh BD là tia phân giác của góc ABC. c) Gọi M là trung điểm của FC. Chứng minh BM I AE.

Làm gấp giúp em với ạ xin cảm ơn

Vẽ một tam giác ABC có A^ = 90 độ, AC = 3cm, C^ = 60 độ. Trên tia đối của tia AC lấy điểm D sao cho AD = AC. a, Vẽ hình b, CM: Tam giác ABD = tam giác ABC c, Tam giác BCD có dạng đặc biệt nào? Vì sao? d, Tính độ dài các đoạn thẳng BC, AB.

bài này khó quá bạn nào giup mik với X. Read the passage and choose the best answers to the questions below: My name is John, and this is my story. Last year just before Christmas my family and our cousin and uncle and aunt decided to go to Perth for holiday. We went in two cars but when we were about halfway there my uncle wanted to turn round and come back. He said it was too far, and it was terribly hot too, one day it was 48 0 C. Even at night it was really hot. Anyway, what we decided to do was to drive back about 160 km to a place where the train went through. Then we put both cars on the train and we all went to Perth by train. That was fun. It was a good train. We had a good time in Perth but we had to cut our holiday short. You see, while we were there, my grandmother in Melbourne died. Most of us flew back but my Dad and my uncle came on the train with the cars and then had to drive back to Melbourne from Port Pirie. It was a really strange holiday because nothing went the way we planned it. 1. When did John’s family go to Perth? A. before Christmas B. before Easter C. before Thanksgiving D. before the New Year 2. Why did John’s uncle want to come back? A. Because it was too hot. B. Because he was too cold. C. Because he was too tired. D. Because it was too boring. 3. In the end John’s family went to Perth……………………. A. by train B. by coach C. by car D. by plane 4. Who died when John’s family were on holiday? A. his mother’s father B. his mother’s mother C. his father’s mother D. his father’s father 5. Most of John family came back…………………… A. by train B. by ship C. by plane D. by car 6. Who in John’s family had to go by train and car to Melbourne? A. his father B. his uncle C. his parents D. his father and uncle

tại sao khi bỏ nước đá lạnh vào nước thì nước đá lạnh lại nổi lên trên?

Một hình vuông có chu vi là 5dm6cm.Biết chu vi của hình vuông bằng chu vi của hình chữ nhật là 9cm.Biết chiều rộng bằng 9cm,tính chiều dài hình chữ nhật đó

làm giúp mình với ạ VIII. Fill in the blanks with suitable prepositions to complete the sentences: Ex: I get up at 6 o’clock every morning. 1. Do you go to school ……… foot or ……… bike? 2. My house is ……… Le Loi Street, her house is ……… 19 Le Lai Street. 3. We are living ……… our parents ……… Ho Chi Minh City. 4. She is interested ……… Literature and English. 5. My birthday is ……… 29 th February, my mother’s birthday is ……… August. 6. Vegetables are very good ……… your health. 7. I received the letter ……… your aunt last week. 8. He wrote a letter ……… his mother last week. 9. These books cost ……… $100. 10. They are playing video games ……… the moment.

Làm đc hết mình cho 5* luôn nhé Thanks

cho tam giác ABC trung tuyến AD. Đường phận giác của góc ADB cắt cạnh AB ở M .đường phận giác của góc ADC cắt cạnh AC. Ở N /A) chứng minh rằng MN sống song với BC /b) gọi k là giáo điểm của AD và MN .chứng minh K là trung điểm của MN /c) chứng minh AM.AC-AB=0

bài 4 và 5 cho 5 sao câu trả lời hay nhất kèm cảm ơn