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thuphuongg
2 năm trước
Vẽ đoạn thẳng AB=6cm. Lấy hai điểm C và D nằm giữa đoạn thẳng AB sao cho AC+BD=9cm a) Chứng tỏ điểm D nằm giữa điểm A và C b) Tính CD
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