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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vẽ đậu mầm,chibi,anime 1 trong 3 nha

I.PRONUNCIATION A.Choose the word that has the underlined part pronounced differently from the others. 1.a. wholy b. wrap c. write d. who 2.a. flood b. good c. foot d. look 3.a. mountain b. country c. drought d. hour 4.a. university b. student c. volunteer d. museum 5.a. handicapped b. advantaged c. organized d. raised II.LANGUAGE FOCUS A.Choose the one word or phrase -a, b, c, or d -that best completes the sentences. 6.The boys were taken ______ a fishing trip last weekend. a. in b. to c. on d. for 7.She frequently volunteers ______ extra work because she really likes her job. a. to b. for c. with d. in 8.We hope that students themselves will enjoy taking part ______ the projects. a. in b. on c. at d. for 9.He volunteered his ______ as a driver. a. job b, work c. service d. help 10.All the teachers work on an entirely ______ basis. a. volunteer b. volunteered c. voluntary d. voluntarily 11.They volunteer to take care of children who have been ______ by the AIDS epidemic. a. supported b. suffered c. left d. orphaned 12.It's filthy' in here! Are there any volunteers to help ______? a. light up b. clean up c. clear up d. take up 13.He eventually ______ his disability to achieve some business success. a. overcame b. destroyed c. overwhelmed d. suffered 14.The new law allows school districts to spend more money on less ______ children. a. advantageous b. disadvantageous c. advantaged d. disadvantaged 15.A lot of children participated in ______ performances. a. raising-fund b. fundraising c. fundraise d. funding-raise

Lễ kí Hiệp định Pa-ri diễn ra vào ngày, tháng, năm nào? A. Ngày 26/01/1973. B. Ngày 27/01/1973. C. Ngày 28/01/1973. D. Ngày 30/01/1973. Giúp tui giải bài này với!

Mọi người giải giúp em bài tiếng anh này với