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Shine96
2 năm trước
Bài 3: Cho HBH ABCD có góc A = 1200, AB = 2AD. a) Chứng minh rằng tia phân giác của góc D cắt AB tại điểm E là trung điểm của cạnh AB. b) Cmr DE vuông góc với EC. c) Tứ giác AECD là hình gì? Vì sao?
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