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           ☆1 inequalities

[ 1/1Inequality]
    Assignment:Find the solution set of inequality (10000.5-0.8n)/(0.4√n) ≤-2.75 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( 10000.5 - 0.8 * n ) / ( 0.4 * √ n ) ≤ -2.75         (1)
        From the definition field of √
        x ≥ 0        (2 )
        From the definition field of divisor
         0.4 * √ x ≠ 0        (3 )

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    From inequality(1)：
         n ≤ 0
    From inequality(2)：
         n ≥ 0
    From inequality(3)：
         n < 0 或  n ＞ 0

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    From inequalities (1) and (2)
         0 ≤ n ≤ 0    (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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