Overview: 4 questions will be solved this time.Among them
           ☆4 integer calculations

[1/% Digital analysis]
    Assignment: Convert 1/7 to decimal.
    Question type: Convert fraction to decimal
    Solution:
        1/7=0.142857
    *Note: Output 6 pure recurring decimals for this fraction,
        有6位（Underlined cyan font）circular section。
[2/% Digital analysis]
    Assignment: Convert 1/8 to decimal.
    Question type: Convert fraction to decimal
    Solution:
        1/8=0.125
    *Note: Can be converted to 3 finite decimals.
[3/% Digital analysis]
    Assignment: Convert 1/9 to decimal.
    Question type: Convert fraction to decimal
    Solution:
        1/9=0.1
    *Note: Output 1 pure recurring decimals for this fraction,
        有1位（Underlined cyan font）circular section。
[4/% Digital analysis]
    Assignment: Convert 1/10 to decimal.
    Question type: Convert fraction to decimal
    Solution:
        1/10=0.1
    *Note: Can be converted to 1 finite decimals.

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