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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 2.78x/(x+1400) >0.88 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        2.78 * x / ( x + 1400 ) >0.88         (1)
        From the definition field of divisor
         x + 1400 ≠ 0        (2 )

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    From inequality(1)：
         x ＞ 648.421053
    From inequality(2)：
         x < -1400 或  x ＞ -1400

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    From inequalities (1) and (2)
         x ＞ 648.421053    (3)

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    The final solution set is :
         x ＞ 648.421053

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