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 3 inequalities：
        2 * x < x ^ 2         (1)
         x ^ 2 < x / 0.9         (2)
         x / 0.9 < x + 2         (3)

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    From inequality(1)：
         x < 0 或  x ＞ 2
    From inequality(2)：
         0 < x < 10/9
    From inequality(3)：
         x < 18

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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!    (4)
    From inequalities (3) and (4)
        x ∈ Φ (Φ is empty)that is, the inequality will never be estatlished within the real number range!    (5)

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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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