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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 71x ≥399-（99+100-139） .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        71 * x ≥399 - ( 99 + 100 - 139 )         (1)

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    From inequality(1)：
         x ≥ 4.774648

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    The final solution set is :
         x ≥ 4.774648

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