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tdm1907
2 năm trước
Cho tam giác ABC vuông tại A và đường cao AH. Gọi các điểm đối xứng của H qua AB, qua AC lần lượt là D,E. Cmr: a. D,A,E thẳng hàng b.BCED là hình thang c. Góc DHE=90 độ
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