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2 năm trước
Cho tam giác ABC có 3 góc nhọn nội tiến trong (O;R) các đg cao BE,CT cắt nhau tạiH cắt đg tròn (O;R)lần lượt tại M và N a) cm 4 điểm B,F,E,C THUỘC 1 ĐG TRÒN b) cm AE.AC=AF.AB c) cm MN//EF
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