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pepam92
2 năm trước
Cho tam giác cân ABC có đáy BC và góc A= 20°. Trên nửa mặt phẳng bờ AC không chứa điểm B lấy điểm D sao cho DA = DB và DAC = 40°. Gọi E là giao điểm của AC và BD. 1). Chứng minh tứ giác ABCD là tứ giác nội tiếp. 2). Tính góc AED
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