Overview: 3 questions will be solved this time.Among them
           ☆3 inequalities

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

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    From inequality(1)：
         a < -2.732051 或  a ＞ 0.732051
    From inequality(2)：
         -3 < a < 1

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    From inequalities (1) and (2)
         -3 < a < -2.732051 或  0.732051 < a < 1     (3)

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    The final solution set is :
         -3 < a < -2.732051 或  0.732051 < a < 1
[ 2/3Inequality]
    Assignment:Find the solution set of inequality -3     Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        -3 < a ^ 2 - 2 * a - 3         (1)
         a ^ 2 - 2 * a - 3 < -2         (2)

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    From inequality(1)：
         a < 0 或  a ＞ 2
    From inequality(2)：
         -0.414214 < a < 2.414214

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    From inequalities (1) and (2)
         -0.414214 < a < 0 或  2 < a < 2.414214     (3)

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    The final solution set is :
         -0.414214 < a < 0 或  2 < a < 2.414214
[ 3/3Inequality]
    Assignment:Find the solution set of inequality a >0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         a >0         (1)

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    From inequality(1)：
         a ＞ 0

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    The final solution set is :
         a ＞ 0

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