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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality -7a^2+20a+4 <0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        -7 * a ^ 2 + 20 * a + 4 <0         (1)

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    From inequality(1)：
         a < -0.187673 或  a ＞ 3.044815

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    The final solution set is :
         a < -0.187673 或  a ＞ 3.044815

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