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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality (600*2+50*n)/(n+2) ≤90 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( 600 * 2 + 50 * n ) / ( n + 2 ) ≤90         (1)
        From the definition field of divisor
         x + 2 ≠ 0        (2 )

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    From inequality(1)：
         n ≤ -2 或  n ≥ 51/2
    From inequality(2)：
         n < -2 或  n ＞ -2

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    From inequalities (1) and (2)
         n < -2 或  n ≥ 51/2    (3)

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    The final solution set is :
         n < -2 或  n ≥ 51/2

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