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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 12 <11*(8+9x)/1.87/7 <13 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        12 <11 * ( 8 + 9 * x ) / 1.87 / 7         (1)
        11 * ( 8 + 9 * x ) / 1.87 / 7 <13         (2)

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    From inequality(1)：
         x ＞ 0.697778
    From inequality(2)：
         x < 83/100

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    From inequalities (1) and (2)
         0.697778 < x < 83/100     (3)

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    The final solution set is :
         0.697778 < x < 83/100

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