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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 21×0.006*a/(19200+4×0.006*a)     Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        21 × 0.006 * a / ( 19200 + 4 × 0.006 * a ) < a / 300         (1)
        From the definition field of divisor
         19200 + 4 × 0.006 * x ≠ 0        (2 )

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    From inequality(1)：
         a ＞ 0
    From inequality(2)：
         a ∈ R （R为全体实数），即在实数范围内，不等式恒成立！

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    From inequalities (1) and (2)
         a ＞ 0    (3)

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    The final solution set is :
         a ＞ 0

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