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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 8/（20×r2/20+r2） >-8/r2 = 0.4 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        8 / ( 20 × r * 2 / 20 + r * 2 ) > -8 / r * 2 0.4         (1)
        From the definition field of divisor
         20 × x * 2 / 20 + x * 2 ≠ 0        (2 )
        From the definition field of divisor
        x ≠ 0        (3 )

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    From inequality(1)：
         r ＞ 0
    From inequality(2)：
         r < 0 或  r ＞ 0
    From inequality(3)：
         r < 0 或  r ＞ 0

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    From inequalities (1) and (2)
         r ＞ 0    (4)
    From inequalities (3) and (4)
         r ＞ 0    (5)

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    The final solution set is :
         r ＞ 0

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