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quyenak645
2 năm trước
cho tg abc cân tại a góc a =50 độ trên đường thẳng bc lấy d trêm tia đối của cb lấy e sao cho ba=cf.từ d kẻ đường vuông góc với bc cắt đường thẳng ab tại m từ e đường vuông góc vs bc cắt ac tại d a] tính góc b góc c của tg abc b] md song songne và md=me cư mn cắt de tại i cm i là trung điểm của d
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