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vukieuoanh
2 năm trước
cho đoạn thẳng ac bằng 5 cm lấy điểm b nằm giữa a và c sao cho ab = 3 cm trên tia đối của tia cb lấy điểm d sao cho cd = 1 cm a) tính bc b) điểm b có phải là trung điểm của đoạn thẳng ab không vì sao c) so sánh ab + bc và 4 x bc
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