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kieu020620
2 năm trước
cho đường tròn (O;R) và một điểm S nằm ngoài đường tròn (O). Từ S kẻ hai tiếp tuyến SA và SB với đường tròn (O) (A và B là hai tiếp điểm).a, CM: tứ giác SAOB nội tiếp và SO vuông góc AB b, vẽ đường thẳng a đi qua S và cắt (O) tại 2 điểm M và N (với a không đi qua tâm đường thẳng O,M nằm giữa S và N ). gọi H là giao điểm của SO và AB ; I là trung điểm của MN . Hai đường thẳng OI và AB cắt tại E. 1, CM: OI.OE=R^2 2, cho SO=2R và MN=R√3 . Hãy tính SM theo R Làm giúp mình vs . Gấp lắm!!!!
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