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

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

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

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

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    From inequality(1)：
         0 < x < 3

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    The final solution set is :
         0 < x < 3

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