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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 0 <(a+13)*(a+13)-28(a*a-a-2) <1 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        0 < ( a + 13 ) * ( a + 13 ) - 28 * ( a * a - a - 2 )         (1)
         ( a + 13 ) * ( a + 13 ) - 28 * ( a * a - a - 2 ) <1         (2)

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    From inequality(1)：
         -2.05505 < a < 4.05505
    From inequality(2)：
         a < -2.048983 或  a ＞ 4.048983

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    From inequalities (1) and (2)
         -2.05505 < a < -2.048983 或  4.048983 < a < 4.05505     (3)

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    The final solution set is :
         -2.05505 < a < -2.048983 或  4.048983 < a < 4.05505

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