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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 4/1 <10/9x <1/3 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        4 / 1 <10 / 9 * x         (1)
        10 / 9 * x <1 / 3         (2)

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    From inequality(1)：
         x ＞ 18/5
    From inequality(2)：
         x < 3/10

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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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