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

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

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

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

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