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

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

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

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

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

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

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

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

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

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

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