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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 215.21 <215.21(1+x%)*0.8 <215.21(1+10%) .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        215.21 <215.21 * ( 1 + x % ) * 0.8         (1)
        215.21 * ( 1 + x % ) * 0.8 <215.21 * ( 1 + 10 % )         (2)

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    From inequality(1)：
         x ＞ 25
    From inequality(2)：
         x < 75/2

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    From inequalities (1) and (2)
         25 < x < 75/2     (3)

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    The final solution set is :
         25 < x < 75/2

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