khi nhấn chìm hoàn toàn một lượng đá nhỏ vào lọ thuỷ tinh có nước dạng hình trụ thì mực nước trong lọ dâng lên 0,85 cm. biết diện tích của đáy lọ thuỷ tinh là 12,8 cm². hỏi thể tích của tượng đá là bao nhiêu?

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