Cho đường tròn tâm O gọi là đường tròn (O) và một điểm M nằm ngoài đường tròn (O) Từ M kẻ hai tiếp tuyến MA MB , và cát tuyến MCD đến đường tròn (O) với A B, là các tiếp điểm, điểm O nằm ngoài góc AMD . Gọi I là giao điểm của OM và AB . Vẽ đường kính AE của O; đường thẳng OM cắt EC và ED lần lượt tại H và K . a) Chứng minh tứ giác MCHB nội tiếp. b) Gọi S là giao điểm của đường thẳng MB và đường thẳng DE . Chứng minh SB.SM =SK. SD c) Chứng minh OH =OK

còn 20 điểm nhưng đang vui vì nick cũ được xác thực nên vẽ anime vui

Giải phương trình: $\sqrt[]{x^2-1}$ - $\sqrt[]{3x^2+4x+1}$ = (8 - 2x)$\sqrt[]{x+1}$

Exercise 1: Put "was“ or "were” in the gap. 1.The teacher …………………… nice. 2. The students ……………………. very clever. 3. But one student ……………….. in trouble. 4. We ……………….. sorry for him. 5. He ………………. nice though. 6. I ……………….. happy. 7. You ……………….. angry. 8. She ………………… in London. 9. He ………………… on holiday. 10. It …………………. cold. 11. We …………………. at school. 12. You …………………… at the cinema. 13.They ………………… at home. 14. The cat ………….. on the roof. 15. The children ……………….. in the garden Exericse 3: Change these sentences into negative and interrogative form. 1. She was tired last night. => ……………………………………………………………………………………………… ……………………………………………………………………………………………… 2. I was in London last month.=> ……………………………………………………………………………………………… ……………………………………………………………………………………………… 3. They were at Nina’s house some days ago.=> ……………………………………………………………………………………………… …………………………………………………………………………………………… 4. My parents were at the party yesterday. => ……………………………………………………………………………………………… ……………………………………………………………………………………………… 5. Tom was at school last Monday.=> ……………………………………………………………………………………………… ……………………………………………………………………………………………… Exercise 4: Supply the correct past simple tense of verbs in brackets. (Affirmative form) 1. I _________ ( stay) at home all weekend. 2. Angela __________ (go) to the cinema last night. 3. My friends __________(have)a great time in Nha Trang last year. 4. My vacation in Hue _____________ (be) wonderful. 5. Last summer I ______________(visit) Ngoc Son Temple in Ha Noi. 6. My parents _______________( be) very tired after the trip. 7. I _______________(buy) a lot of gifts for my little sister. 8. Lan and Mai _____________ (see) sharks, dolphins and turtles at Tri Nguyen aquarium. 9. Trung ________________ (eat) chicken and rice for dinner. 10. They _______________ (talk) about their holiday in Hoi An. Exercise 5: Supply the correct past simple tense of verbs in brackets. (Negative form) 1. I _________________ (not / drink) any beer last night. 2. She _________________ (not/ get on) the bus in the centre of the city. 3. I _________________ (not / change) trains at Victoria. 4. We _________________ (not/ wake up) very late. 5. I _________________ (not/ receive) £300 when my uncle died 6. We _________________ (not / use) the computer last night. 7. He _________________ (not/ have) a shower. 8. They _________________ (not/ live) in Paris. 9. She _________________ (not/ read) the newspaper yesterday. 10. I _________________ (not / watch) TV.

Giúp mik với Tìm lỗi sai =>sửa + giải thích giúp

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Mark the letter A, B, C or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions. Question 43: He didn’t meet her even one time since they said goodbye together. A B C D Question 44: I bought an interesting book last week, but I cannot find them now. A B C D Question 45: He's such a bored guy because he only ever talks about himself. A B C D Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions. Question 46: She began to play the piano three years ago. A. She has played the piano since three years. B. She has played the piano for three years C. She doesn’t play the piano now. D. She stops playing the piano now. Question 47: “I’ll help you repair this washing machine, Jenny”, he said. A. He admitted helping Jenny repair that washing machine. B. He denied helping Jenny repair that washing machine. C. He promised to help Jenny repair that washing machine. D. He refused to help Jenny repair that washing machine. Question 48: You are supposed to be here at 9 a.m, but it is 11 a.m now. A. You needn’t have been here two hours ago. B. You must have been here two hours ago. C. You should have been here two hours ago. D. You oughtn’t to have been here two hours ago. Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions. Question 49: You didn’t help me.I couldn’t overcome the problem. A.As long as you helped me, I could overcome the problem. B. If you didn’t help me, I couldn’t overcome the problem. C. If only you helped me to overcome the problem. D. I wish you had helped me to overcome the problem. Question 50:I posted the letter. I realized that I had forgotten to put on a stamp. A. Only after posting the letter did I realize that I had forgotten to put on a stamp. B. Hardly had I realized that I had forgotten to put on a stamp when I posted the letter. C.Not only did I realize that I had forgotten to put a stamp on the letter but I posted it as well. D. No sooner had I posted the letter than I forgot to put on a stamp.

people đi với other hay another?

Calli chữ ' BFF" đi Yc ko app Đẹp Có trang trí 1 píc kí 1 píc ko Vt có tâm dùm Dùng các loại bút chuyên dụng nha Hóng~~~~

viết 1 đoạn văn khoảng 2/3 trang giấy thi trình bày suy nghĩ của em về tinh thần đoàn kết được gợi ra từ đoạn trích "Đất nước ở trong tim"