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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 60÷（x+20）+1+60÷（x-20） ≤5 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        60 ÷ ( x + 20 ) + 1 + 60 ÷ ( x - 20 ) ≤5         (1)

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    From inequality(1)：
         x ≤ -20 或  -10 ≤ x ≤ 20 或  x ≥ 40

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    The final solution set is :
         x ≤ -20 或  -10 ≤ x ≤ 20 或  x ≥ 40

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