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tranvantan
2 năm trước
Từ một điểm M nằm bên ngoài đường tròn,kẻ tiếp tuyến ME,MF.Đường kính EOI,OM cắt EF tại K, H là hình chiếu của lên EI,MI cắt đường tròn tại D. a) Cm:tg MEOF nội tiếp đường tròn. b).Cm:OM ⫽ FI. c).Cm:MD.MI=MK.MO. d).Cm:MI đi qua trung điểm của FH. Giúp mình với các cậu,mình cần gấppp.
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