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Thucuyen1442001
2 năm trước
Bài 1: Cho ΔABC nhọn có góc BAC=60 độ, vẽ đường tròn đường kính BC tâm O cắt AB, AC tại D và E. Chứng minh: góc ODE=60 độ Bài 2: Cho ΔABC nhọn nội tiếp (O), đường cao AD, BE của ΔABC cắt nhau tại H, AD cắt (O) tại I. Chứng minh: DH=DI
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