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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality R*5.1*（4.7+100）/（R+5.1） <1/(2*π*100) .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         R * 5.1 * ( 4.7 + 100 ) / ( R + 5.1 ) <1 / ( 2 * π * 100 )         (1)
        From the definition field of divisor
         x + 5.1 ≠ 0        (2 )

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    From inequality(1)：
         -5.1 < R < 0.000015
    From inequality(2)：
         R < -51/10 或  R ＞ -51/10

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    From inequalities (1) and (2)
         -5.1 < R < 0.000015     (3)

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    The final solution set is :
         -5.1 < R < 0.000015

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