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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality -20*(1+a)^3+5*(1+a)^2+7*(a+1)+20 >0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        -20 * ( 1 + a ) ^ 3 + 5 * ( 1 + a ) ^ 2 + 7 * ( a + 1 ) + 20 >0         (1)

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    From inequality(1)：
         a < 0.2152

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    The final solution set is :
         a < 0.2152

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