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nh0k_si_297
2 năm trước
) Cho đoạn thẳng AB dài 7cm. Trên tia AB lấy điểm I sao cho AI = 4 cm. Trên tia BA lấy điểm K sao cho BK = 2 cm. Hãy chứng tỏ rằng I nằm giữa A và K. Tính IK. b) Trên tia Ox cho 4 điểm A, B, C, D. biết rằng A nằm giữa B và C; B nằm giữa C và D ; OA = 5cm; OD = 2 cm ; BC = 4 cm và độ dài AC gấp đôi độ dài BD. Tìm độ dài các đoạn BD; AC. Nhanh lên các anh chị ơi em cần gấp lắm
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