“数”与“组成它的数码个数”之间的关系．一位数共有9个，组成所有的一位数需要9个数码；两位数共有90个，组成所有的两位数需要2×90＝180(个)数码；三位数共有900个，组成所有的三位数需要3×900＝2700(个)数码。，以此类推
一位数有9个数码，两位数有180个数码，三位数2700个数码，四位数36000个数码，五位数
450000个数码
一张纸相当于两页，一页即一面。
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具体点
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