Bài 1 Trên tia ox lấy hai điểm a và b sao cho oa = 3cm OB = 8cm a, chứng tỏ điểm a nằm giữa hai điểm o và b b, tính độ dài đoạn thẳng AB c, trên tia đối của tia oa lấy điểm d sao cho AD = 1 cm chứng tỏ d là trung điểm của đoạn thẳng OB Bài 2 Cho đoạn thẳng AB dài 7 cm gọi I là trung điểm của AB a, nêu cách vẽ b, tính độ dài ib c, trênTia đối của tia ab lấy điểm k sao cho AK = 3,5 cm so sánh kI với Ab

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