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htqkhanh2000
2 năm trước
3/ Cho A ABC nhọn,đường cao BE; AD cắt nhau tại H. al Cho BC 12cm;góc C = 40°.Tính BE b/ CMR: A DEC đồng dạng AABC c/ Lấy M thuộc BE; N thuộc AD sao cho góc AMC = góc BNC = 90°. CMR: A CMN cân %3D d/ Giả sử H là trung điểm của AD.CMR: tan B. tan C = 2 Giúp em gấp ạ
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