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

[ 1/2Inequality]
    Assignment:Find the solution set of inequality -2x ≤4 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        -2 * x ≤4         (1)

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    From inequality(1)：
         x ≥ -2

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

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

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    From inequalities (1) and (2)
         x ＞ 0    (3)

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    The final solution set is :
         x ＞ 0

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