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santalaugh
2 năm trước
Bánh xe bé của một máy kéo có bán 0,5m . Bánh xe lớn của máy kéo đó có bán kính 1m . Hỏi khi bánh xe bé lăn được 10 vòng thì bánh xe lớn lăn được mấy vòng ?
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