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hieurongbay
2 năm trước
cho hình thang cân ABCD ( AB > CD ) nội tiếp trong đường tròn (O). Tiếp tuyến với (O) tại A và D cắt nhau tại E. Gọi I là giao điểm của hai đường chép AC và BD. a, CMR: AEDI nội tiếp b, CMR: AB//EI
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