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Cherry1004
2 năm trước
Cho (O,R) có AB là đường kính. Vẽ tiếp tuyến Ax lấy bất kỳ M thuộc Ax. MB cắt (O) tại C. a) Chứng minh AC vuông MB b) Tính BC.BM theo R c) Vẽ dây AD vuông MO tại H. Chứng minh MD2=MC.MB d)Vẽ DE vuông AD tại E. DE cắt MB tại I. Chứng minh ID=IE
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