Một em bé khi ăn lạc đậu phộng luộc muốn chọn được những củ to em đã khôn ngoan cầm dỗ lạc lắc mạnh nhiều lần những củ lạc to đã trồi lên trên Hãy giải thích cơ sỡ của cách làm đó . ( Thế Năng )

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