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dothilieu06081983
2 năm trước
cho đường thẳng a và bốn điểm A, B, C, D không thuộc a sao cho các đoạn thẳng AB, CD cắt a và đaoạn thẳng BC không cắt a. Chứng minh rằng: a, đoạn thẳng BD cắt a b, đoạn thẳng AD không cắt a
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