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Pham
2 năm trước
Cho tam giác abc vuông tại b,đường phân giác ad.Qua d kẻ de vuông góc với ac tại e.Gọi k là giao điểm của ab với ed.C/m: a] AD vuông góc với CK b] Tứ giác BECK là hình thang cân
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