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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality (4+x)*sqrt(0.09-x*x) <0.09 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( 4 + x ) * sqrt ( 0.09 - x * x ) <0.09         (1)
        From the definition field of √
         0.09 - x * x ≥ 0        (2 )

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    From inequality(1)：
         x < -0.299013
    From inequality(2)：
         -3/10 ≤ x ≤ 3/10

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    From inequalities (1) and (2)
         -3/10 ≤ x < -0.299013    (3)

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    The final solution set is :
         -3/10 ≤ x < -0.299013

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