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linhdanhanoi
2 năm trước
Cho ABC có AB < AC, hai đường cao AD và BE cắt nhau ở H và có AD = BE. a) So sánh <BAD và <CAD b) Tam giác ABC là tam giác gì? Chứng minh. c) Chứng minh rằng đường thẳng CH là trung trực của AB d) Chứng minh rằng DE // BA e) Nếu O là trung điểm của CH, chứng minh OD = OE
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