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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 6×16/[（d/60）^4+（0.6/0.4）]/π/（d×10^（-3））^3 ≤50 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        6 × 16 / ( ( d / 60 ) ^ 4 + ( 0.6 / 0.4 ) ) / π / ( d × 10 ^ ( -3 ) ) ^ 3 ≤50         (1)
        From the definition field of divisor
         ( x / 60 ) ^ 4 + ( 0.6 / 0.4 ) ≠ 0        (2 )
        From the definition field of divisor
         x × 10 ^ ( -3 ) ≠ 0        (3 )

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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)：
         d ∈ R （R为全体实数），即在实数范围内，不等式恒成立！
    From inequality(3)：
         d < 0 或  d ＞ 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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