Mathematics, 12.12.2021 07:30 tanabugg

cho tam giác ABC cân tại A, đường cao AH. gọi M, N lần lượt là trung điểm của các cạnh AB, AC. gọi E là điểm đối xứng với H qua M. chứng minh răng AH, MN, EC đồng quy. Tam Giác ABC cần điều kiện gì thì tứ giác AHBE là hình vuông

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cho tam giác ABC cân tại A, đường cao AH. gọi M, N lần lượt là trung điểm của các cạnh AB, AC. gọi E...

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