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1. Vẽ đoạn thẳng AB dài 7 cm. lấy điểm C nằm giữa A,B sao cho AC=3cm. a) Tính độ dài đoạn thẳng CB b) vẽ trung điểm I của đoạn thẳng AC. Tính IA,IC. c) Trên tia đối của tia CB lấy điểm D sao cho CD = 7 cm . So sánh CB và DA.
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