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hoangthuyhaianh
2 năm trước
Cho đoạn thẳng BC. Trên cùng một nửa mặt phẳng bờ là BC, vẽ các tia Bx, Cy cắt nhau tại A sao cho góc CBx=2* góc BCy. kẻ AH vuông góc BC. Trên tia dối của tia Bx, Lấy E sao cho BE=BH. Gọi D là giao điểm của EH và AC a. CMR: ΔHDC và ΔADH cân b. Trên cạnh BC lấy B' sao cho H là trung điểm của BB'. CMR: ΔABB' cân c. CMR: ΔAB'C cân d. Cmr : AE=HC
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