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jingyij62
2 năm trước
Cho tam giác ABC có ba góc nhọn ab nhỏ hơn ac kẻ bd vuông góc với ac ce vuông góc với ab so sánh góc dbc và góc ecb Gợi ý: Đây là quan hệ giữa góc và cạnh đối diện trong một tam giác
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