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ngoantrung1985
2 năm trước
để đưa 1 vật có khối lượng 30kg lên cao bằng ròng rọc động người thợ xây phải kéo dây đoạn 12m . tính lực kéo . tính lực kéo và độ cao khi đưa vật khi bỏ qua ma sát
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