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anhthu06042k3
2 năm trước
Cho tam giác ABC cân tại A (A <90 độ) vẽ BH vuông góc AC (H thuộc AC) CK vuông góc AB (K thuộc AB). a)chứng minh AH =AK, b) gọi I là giao điểm của BH và CK. Chứng minh AI là tia phân giác của góc ABC. c) chứng minh KH //BC
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