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tuyetnguyen
2 năm trước
vẽ đoạn thẳng AB=5cm a, trên đoạn thẳng AB lấy hai điểm M và N sao cho MN=1cm. Tính AM+BN b, trên đoạn thẳng AB lấy 2 điểm M và N sao cho AM+BN=7cm.Tính MN
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