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ntk300601
2 năm trước
Cho nửa đường tròn O đường kính AB. H là một điểm tùy ý nằm giữa O, B đường thẳng vuông góc với AB tại H cắt nửa đường tròn tại điểm K. Gọi I là Trung điểm của dây BK. OI cắt KH tại điểm E. Tia BE cắt nửa đường tròn tại F. a) chứng minh:AEHF, HOIK NỘI TIẾP B) chứng minh BE. BF=BH. BA và suy ra BE. BF+AH. AB không đổi Giải hộ mình nhanh ạ, làm đúng từng bước giúp mình ạ
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