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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality （（720.75+57.18（x-4.2）））（x-4.2） ≥0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( ( 720.75 + 57.18 * ( x - 4.2 ) ) ) * ( x - 4.2 ) ≥0         (1)

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    From inequality(1)：
         x ≤ -8.404932 或  x ≥ 21/5

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    The final solution set is :
         x ≤ -8.404932 或  x ≥ 21/5

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