Cho đường tròn đường kính Ab . Kẻ tiếp tuyến Bx và lấy điểm C và D thuộc cùng 1 nửa đường tròn . Các tia AC và AD cắt tia Bx lần lượt tại E và F ( F nằm giữa B và E ) . Chứng minh : A) Chứng minh : FB^2= FA.FD B) Tứ giác CEFD nội tiếp đc 1 đường tròn C) AE.AC= AF . AD

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Form: It + to be+ Vpp+ that + S + V Key: It's said that this complex of monuments is one of the wonders of Viet Nam. 1. They think he is a good doctor. => It is thought that he is a good doctor. 2. People say that he has got a lot of gold. .......................................................................................................................................... 3. They hope that the project will be finished on schedule. .......................................................................................................................................... 4. They reported that he had won a good contract. .......................................................................................................................................... 5. People claimed that the house was haunted. .......................................................................................................................................... 6. People expect that the number of tourists to their city will go up. .......................................................................................................................................... 7. They recognize that the homesickness is natural. .......................................................................................................................................... 8. They hope that their neighbourhood will become a better place to live. ..........................................................................................................................................