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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality lg(5-x)^2 >= 0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         lg ( 5 - x ) ^ 2 >= 0         (1)
        From the definition field of lg
         5 - x > 0        (2 )

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    From inequality(1)：
         x ≤ 4 或  4 ≤ x ≤ 4 或  x ≥ 4
    From inequality(2)：
         x < 5

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    From inequalities (1) and (2)
         x ≤ 4 或  4 ≤ x ≤ 4 或  4 ≤ x < 5    (3)

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    The final solution set is :
         x ≤ 4 或  4 ≤ x ≤ 4 或  4 ≤ x < 5

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