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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 20lgx >= 20 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        20 * lg x >= 20         (1)
        From the definition field of lg
        x > 0        (2 )

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    From inequality(1)：
         x ≥ 10
    From inequality(2)：
         x ＞ 0

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    From inequalities (1) and (2)
         x ≥ 10    (3)

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    The final solution set is :
         x ≥ 10

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