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HUYANHAN
2 năm trước
cho tam giác ABC cân tại A, 2 đường cao BD và CE cắt nhau tại H a) chứng minh tam giác AEC đồng dạng với tam giác ADB b) chứng minh BExDH=CDxEH c) chứng minh hình thang cân BEDC
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