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thanhthuynguyenthi12345
2 năm trước
mong các bạn giúp mình, 60 điểm lận đó! chỉ cần 1 trong 2 bài thôi! cả hai thì tốt 1. Cho đoạn thẳng AB với CD song song và bằng nhau. Gọi HB và KD theo thứ tự là hình chiếu của AB và CD lên đường thẳng BD. C/m: HB = KD. 2. Cho tam giác ABC cân tại A. Trên cạnh AB lấy điểm E , trên cạnh AC lấy F sao cho BE = CF. C/m: + BC + BF < BF + CE.
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