Overview: 2 questions will be solved this time.Among them
           ☆2 inequalities

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

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    From inequality(1)：
         x < -1/2 或  x ＞ 0

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

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    From inequality(1)：
         -1 < x < 1/2

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    The final solution set is :
         -1 < x < 1/2

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