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hoaithuong556699
2 năm trước
B1:cho tam giác ABC,M là trung điểm của AC.Trên tia đối tua MB lấy D sao cho MB=MD.CM:Góc ABC=góc ADC B2: cho ΔABC vuông ở C,có ∠A=60 độ.Tia phân giác của ∠BAC cắt BC tại E ,kẻ EK ⊥AB ,BD ⊥AE.Cm a.AK=KB b.AD=BC
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