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nhaky2892007
2 năm trước
cho Δ ABC cân tại A, AB = AC = 5cm; BC = 6cm. kẻ AH ⊥ BC (H ∈ BC) a) chứng minh HB = HC b) tính AH c) kẻ HD ⊥ AB (D ∈ AB); HE ⊥ AC(E ∈ AC). CMR: Δ HDE là tam giác cân
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