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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 0.2×0.9×x/(0.2×0.9×x+0.3×0.1×x+0.5×0.5×x) >= 0.9 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        0.2 × 0.9 × x / ( 0.2 × 0.9 × x + 0.3 × 0.1 × x + 0.5 × 0.5 × x ) >= 0.9         (1)
        From the definition field of divisor
         0.2 × 0.9 × x + 0.3 × 0.1 × x + 0.5 × 0.5 × x ≠ 0        (2 )

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    From inequality(1)：
        The solution set is empty, that is, within the range of real numbers, the inequality will never be established!
    From inequality(2)：
         x < 0 或  x ＞ 0

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    The final solution set is :
        The solution set is empty,that is, the inequality will never be estatlished within the real number range.

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