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lhtaphuoctien0109
2 năm trước
Bài 1: Cho ∆ABC cân tại A ( 𝐴̂<900), vẽ BD vuông góc AC và CE vuông góc AB. Gọi H là giao điểm của BD và CE. a) Chứng minh : Tam giác ABD = Tam giác ACE b) Cho 𝐷𝐵𝐶̂=250tính số đo góc BCE. c) Chứng minh Tam giác AED cân d) Chứng minh AH là đường trung trực của BC
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