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Câu 10: Cho đường kính BC cố định và BC=2R. Lấy A di động trên đường tròn (A khác B và C). a.CMR: tam giác ABC vuông b.CMR: 𝑆𝐴𝐵𝐶 ≤ 𝑅2 Câu 11: Cho tam giác ABC nhọn nội tiếp đường tròn (O), các đường cao BE, CF cắt nhau tại H. a.CM 4 điểm B,F,E,C thuộc cùng 1 đường tròn b.Kẻ đường kính AA’ của (O). CM tứ giác BHCA’ là hình bình hành Giải 1 bài cũng được ạ! Được 2 bài thì tốt ạ ☺️

giúp mình với : 2 ô tô xuất phát từ a và b cùng một lúc và đi ngược chiều nhau sau 2 giờ chúng gặp nhau quãng đường ab dài 210 km tính vận tốc mỗi ô tô biết vận tốc ô tô đi từ a lớn hơn vận tốc ô tô đi từ b là 5 km / h mình sẽ tim 5 *

1. She (not study) ………. on Saturday. 2. He (have) ………. a new haircut today. 3. I usually (have) ……….breakfast at 6.30. 4. Peter (not/ study)……….very hard. He never gets high scores. 5. My mother often (teach)……….me English on Saturday evenings. 6. I like Math and she (like)……….Literature. 7. My sister (wash)……….the dishes every day. 8. They (not/ have)……….breakfast every morning. giúp mình với các bạn

Cho tam giác ABC vuông tại A, Đường cao AH, biết AB =4cm, AC = 7,5 cm , Tính BH, HC cho tam giác ABC vuông tại A,đường cao AH,biết AB=4cmC=7cm.,

B.Choose the word or phrase -a, b, c, or d -that best completes the sentence. 16.I'm sure it's not my fault that Peter found out what we were planning. I don't remember ______ anyone about it. a. to tell b. being told c. having told d. to be told 17.The charity is appealing for volunteers ______ elderly patients to and from hospital. a. to take b. taking c. taken d. who take 18.The building ______ the earthquake but then by a fire. a. was survived - destroyed b. survived - was destroyed c. survived - destroyed d. was survived - was destroyed 19.______ by the boys' behaviour, she complained to the head teacher. a. She annoyed b. Annoyed c. She was annoyed d. Annoying 20.'Wait a minute,' said Frank, ______ through the door. a. run b. runs c. running d. ran 21.______ a hotel, we looked for somewhere to have dinner. a. Finding b. We found c. Found d. Having fauna 22.The children enjoyed ______ on fishing .trips. a. taking b. to be taken c. being taken d. having taken 23.Stacey seems like a bright student. She's always the first ______ her work. a. to finish b. finishing c. being finished d. to be finished 24.We were shocked to hear the news of your ______. a. having fired b. to be fired c. having been fired d. to have been fired 25.I think I hear someone ______ the back window. Do you hear it, too? a. trying open b. trying to open c. try opening d. try to open C.Identify the one underlined word or phrase - A, B, C or D -that must be changed for the sentence to be correct. 26.When I was sick with the flu, my mother made me to eat soup and rest in bed A B C D 27.Having lived here for seven years, my friend is used to speak English with A B C all her classmates. D 28.To grow well, a tree must be well-suited to the area where is it planted. A B C D 29.Despite modern medical technology, many diseases causing by viruses I A B are still not curable. C D 30.We should have been informed Janis about the change in plans regarding our A B C weekend trip to the mountains. D

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