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Mathematics, 17.09.2021 14:20 sierravick123owr441

Cho tam giác ABC nhọn có E, F,G lần lượt là trung điểm của AB, AC, BC, AH là đường cao. CM: a/ tứ giác FEDC là hình thang
b/ tứ giác GEFC là hình bình hành
c/ tứ giác EFGH là hình thang cân

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Cho tam giác ABC nhọn có E, F,G lần lượt là trung điểm của AB, AC, BC, AH là đường cao. CM: a/ tứ...

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