Bài 44.4: Một thấu kính có một mặt phẳng và một mặt cong là mặt cầu lõn bán kính R. Một vật AB đặt trước thấu kính ta thu được ảnh A'B'có kid thước A'B' bàằng AB và cách vật 6 cm. a. Thấu kính trên là thấu kính gì? b. Tính khoảng cách từ vật đến thấu kính.

Cho ΔABC có góc A = $120^{o}$, các tia phân giác của các góc A và C là AD, CE cắt nhau tại O. Đường phân giác góc ngoài B của ΔABC cắt AC tại F. Chứng minh: a) Góc FBO = $90^{o}$ b) DF là tia phân giác của góc D của ΔABD c) D, E, F thẳng hàng

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B-YES-NO QUESTIONS 1. Lisa said to me, “Do you want me to buy a magazine for you?”  Lisa asked me.......................................................................................................................... 2. Mr. Black asked his secretary, “Do you happen to see my report anywhere?”  Mr. Black asked his secretary ................................................................................................ 3. “Are you free this Sunday morning, Peter?”  Peter‟s father asked ................................................................................................................ 4. “Do you like doing gymnastics?” Adam asked me.  Adam asked me....................................................................................................................... 5. “Are you a student in this class?” She asked me.  She asked me........................................................................................................................... 6. The teacher asked me, “Are you interested in learning English?”  The teacher asked me.............................................................................................................. 7. Helen asked that child , “Are you going to visit your aunt tomorrow?”  Helen asked that child............................................................................................................. 8. I asked my cousin, “Do you love reading books in this library?”  I asked my cousin.................................................................................................................... 9. “Did you buy these flowers on Eve?” She asked me  She asked me........................................................................................................................... 10. “Have you finished writing transformations?”  She wondered.......................................................................................................................... C-WH- QUESTIONS 1. “Who puts salt in my cup of coffee?”  He asked ................................................................................................................................ 2. Mary said, “What can I do to help you with your homework, Tom?”  Mary asked ............................................................................................................................ 3. The police said: “What are you doing here?”  The police asked my uncle...................................................................................................... 4. He asked “What do you know about Tom, Daisy?”  He asked Daisy ....................................................................................................................... 5. The teacher asked me, “Why are you so late today?”  The teacher asked me.............................................................................................................. 6. “How many people are there in your family?” She asked him.  She asked him ......................................................................................................................... 7. They said to her “When will your father leave here for the USA?”  They asked her........................................................................................................................ 8. My father said, “What country do you come from, Billy?”  My father asked Billy............................................................................................................. 9. She said, “What do you think about listening to these songs right now, Peter?”  She asked Peter ....................................................................................................................... 10. “What kind of books are you fond of in this shop?” They asked me  They asked me ........................................................................................................................

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II. Make questions, for the underlined words or phrases. 1. They sometimes go sailing in the fall …………………………………………………… 2. The weather is cool and wet now in London ................................................................................... 3. The Great Wall of China is over 6.000 kilometers long .................................................................................. 4. She walks to shool every day .................................................................................. 5. The man in the car is our new teacher .................................................................................. 6. We are having bread and milk for breakfast .................................................................................. 7. There are ten boys and nineteen girls in our class .................................................................................. 8. My brother gets up at a quarter to six ..................................................................................

Cho tứ giác ABCD có AB = DC; AD = DC = AC và ∠A = $105^{o}$. Tính các góc ∠D, ∠B, ∠C? Vẽ hình nữa nha. Làm nhanh giúp, mình đang cần gấp.

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