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lingoc5243
2 năm trước
Ai giup mik với ;-; Từ M ngoài (o) vẽ hai tiếp tuyến MA,MB. Vẽ đường kính AC, Từ C vẽ đường thẳng vuông góc AC cắt AB tại D. Từ N thuộc cung AB nhỏ, vẽ tiếp tuyến tại N cắt MA,MB tại E,F CMR: nếu diện tích tam giác AMO= 2 LẦN DIỆN TÍCH EOF thì ME+MF=3EF
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