Overview: 1 questions will be solved this time.Among them
           ☆1 integer calculations

[1/% Digital analysis]
    Assignment: Convert 1/645 to decimal.
    Question type: Convert fraction to decimal
    Solution:
        1/645=0.0015503875968992248062
    *Note: 22-digit mixed cycle decimal is output for this fraction,
        有21位（Underlined cyan font）circular section。

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