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dinhluudq
2 năm trước
Cho Δ ABC và đường cao AH.Trên AC lấy điểm D sao cho $\frac{AD}{AC}$ = $\frac{BH}{BC}$ a) Chứng minh DH//AB b) Tính AB, biết DH=6cm và $\frac{BH}{BC}$ =$\frac{1}{4}$
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