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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality (3600-20*72)/(72+m)+20 ≤40 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( 3600 - 20 * 72 ) / ( 72 + m ) + 20 ≤40         (1)
        From the definition field of divisor
         72 + x ≠ 0        (2 )

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    From inequality(1)：
         m ≤ -72 或  m ≥ 36
    From inequality(2)：
         m < -72 或  m ＞ -72

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    From inequalities (1) and (2)
         m < -72 或  m ≥ 36    (3)

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    The final solution set is :
         m < -72 或  m ≥ 36

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