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anh2002
2 năm trước
Cho Δ vuông ABC có A= 30 độ, B=90 độ. M là trung điểm của BC. trên tia đối của MB, lấy điwwmr D sao cho MD=MB. Chứng minh: a, Δ MAB= ΔMCD b,AB=CD ; AB song song CD c,CD ⊥ BC d, AC=DB E,AC=2MB hay BM= AC/2
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