Overview: 2 questions will be solved this time.Among them
           ☆2 inequalities

[ 1/2Inequality]
    Assignment:Find the solution set of inequality x ≤100 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         x ≤100         (1)

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    From inequality(1)：
         x ≤ 100

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    The final solution set is :
         x ≤ 100
[ 2/2Inequality]
    Assignment:Find the solution set of inequality a ≥（2000-10a）/（90-a) .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         a ≥ ( 2000 - 10 * a ) / ( 90 - a )         (1)
        From the definition field of divisor
         90 - x ≠ 0        (2 )

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    From inequality(1)：
         27.63932 ≤ a ≤ 72.36068 或  a ≥ 90
    From inequality(2)：
         a < 90 或  a ＞ 90

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    From inequalities (1) and (2)
         27.63932 ≤ a ≤ 72.36068 或  a ＞ 90    (3)

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    The final solution set is :
         27.63932 ≤ a ≤ 72.36068 或  a ＞ 90

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