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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 15 <13*(8+9x)/1.87/7 <16 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        15 <13 * ( 8 + 9 * x ) / 1.87 / 7         (1)
        13 * ( 8 + 9 * x ) / 1.87 / 7 <16         (2)

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    From inequality(1)：
         x ＞ 0.789316
    From inequality(2)：
         x < 0.901197

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    From inequalities (1) and (2)
         0.789316 < x < 0.901197     (3)

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    The final solution set is :
         0.789316 < x < 0.901197

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