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

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

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    From inequality(1)：
         x ＞ 393258427/500000
    From inequality(2)：
         x < -1400 或  x ＞ -1400

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    From inequalities (1) and (2)
         x ＞ 393258427/500000    (3)

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    The final solution set is :
         x ＞ 393258427/500000

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