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minhtran271104
2 năm trước
Cho tam giác ABC nhọn (AB>AC). Vẽ (O) có đường kính BC , đường tròn (O) cắt AB và AC lần lượt tại E và D a) Cmr : BD vuông góc AC b) BD cắt CE tại H Chứng minh rằng AH vuông góc BC
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