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khadang
2 năm trước
Cho nửa đường tròn (O;R), đường kính AB. M là một điểm thuộc nửa đường tròn (O). Đường cao MH. Tiếp tuyến tại M của (O) cắt tiếp tuyến tại A ở E, cắt tiếp tuyến tại B ở F. OE cắt AM tại P; EB cắt MH tại K; Ò cắt MB tại Q 1) Tính MH; HA; HB theo R khi góc ABM = 30 độ 2) Tứ giác MPOQ là hình gì? Vì sao? 3) Xác định vị trí của M trên nửa đường tròn (O) để diện tích tam giác EOF nhỏ nhất. Tính giá trị nhỏ nhất đó theo R 4) CMR: P, K, Q thẳng hàng *Giúp mình với, Hứa vote 5*
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