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樓上理解錯題意了只有一位數的平方數是1—3的平方:1、4、9只有兩位數的平方數是4—9的平方只有三位數的平方數是10—31的平方只有四位數的平方數是32—99的平方而1-99這些數平方後的位數和為1×3+2×6+3×22+4×…
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