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phamthaobkdn
2 năm trước
Một học sinh đi đều lên tầng ba cao 12m, tổng cộng các cầu thang dài 30m. Tính công do hoc sinh đó sinh ra. Biết rằng học sinh đó nặng 48kg và lực cản trong quá trình chuyển động là 25N Ghi tóm tắt giải dễ hỉu ạ
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