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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 2x     Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        2 * x < x + 2         (1)
         x + 2 <5 * x / 4         (2)

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    From inequality(1)：
         x < 2
    From inequality(2)：
         x ＞ 8

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    From inequalities (1) and (2)
        x ∈ Φ (Φ is empty)that is, the inequality will never be estatlished within the real number range!    (3)

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    The final solution set is :
        x ∈ Φ (Φ is empty)that is, the inequality will never be estatlished within the real number range!

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