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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 1/(10(1-r^2))-(1/5)-r^2 >0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        1 / ( 10 * ( 1 - r ^ 2 ) ) - ( 1 / 5 ) - r ^ 2 >0         (1)
        From the definition field of divisor
         10 * ( 1 - x ^ 2 ) ≠ 0        (2 )

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    From inequality(1)：
         0.953888 < r < 1
    From inequality(2)：
         r < -1 或  -1 < r < 1 或  r ＞ 1

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    From inequalities (1) and (2)
         0.953888 < r < 1     (3)

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    The final solution set is :
         0.953888 < r < 1

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