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huonggianghop83
2 năm trước
Cho 3 đường thẳng song song a, b, c theo thứ tự ấy, điểm A thuộc a, điểm B thuộc b. Gọi M là một điểm bất kì thuộc c. MA cắt b ở B', MB cắt a ở A'. Chứng minh rằng khi điểm M chuyển động trên c thì đường thẳng A'B' luôn luôn đi qua 1 điểm cố định.
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