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

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

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    From inequality(1)：
         -1.280776 < x < 0.780776
    From inequality(2)：
         x < 0 或  x ＞ 0

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    From inequalities (1) and (2)
         -1.280776 < x < 0 或  0 < x < 0.780776     (3)

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    The final solution set is :
         -1.280776 < x < 0 或  0 < x < 0.780776

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