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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 1600*1.2x*（2.2/（2.8/1.4x）） >1600*1.2x*（2.2/（2.8/1.4x））x <5 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        1600 * 1.2 * x * ( 2.2 / ( 2.8 / 1.4 * x ) ) >1600 * 1.2 * x * ( 2.2 / ( 2.8 / 1.4 * x ) ) * x         (1)
        From the definition field of divisor
         2.8 / 1.4 * x ≠ 0        (2 )
        1600 * 1.2 * x * ( 2.2 / ( 2.8 / 1.4 * x ) ) * x <5         (3)
        From the definition field of divisor
         2.8 / 1.4 * x ≠ 0        (4 )

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    From inequality(1)：
         x < 1
    From inequality(2)：
         x < 0 或  x ＞ 0
    From inequality(3)：
         x < 0.002367
    From inequality(4)：
         x < 0 或  x ＞ 0

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    From inequalities (1) and (2)
         x < 0 或  0 < x < 1     (5)
    From inequalities (3) and (5)
         x < 0 或  0 < x < 0.002367     (6)
    From inequalities (4) and (6)
         x < 0 或  0 < x < 0.002367     (7)

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    The final solution set is :
         x < 0 或  0 < x < 0.002367

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