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kieungan815
2 năm trước
Cho ∆abc vuông tại a đường phân giác BD (D thuộc AC) Kẻ DH vuông góc với BC(H thuộc BC). Gọi M là giao điểm của BA và HD. Chứng minh a. AD=HD b. BD vuông góc với MC c.Góc DMC=góc DCM
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