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1- Vẽ đường thẳng d và điểm A không thuộc d. a/ Xác định vị trí hai điểm M và N sao cho đoạn thẳng AM cắt đường thẳng d, đoạn thẳng AN không cắt đường thẳng d? b/ Lấy điểm B trên đường thẳng d sao cho tia AB nằm giữa hai tia AM và AN ?
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