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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality (a^2+9)/(3*a^2-6*a+9) <= a/3+4/3 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         ( a ^ 2 + 9 ) / ( 3 * a ^ 2 - 6 * a + 9 ) <= a / 3 + 4 / 3         (1)
        From the definition field of divisor
         3 * x ^ 2 - 6 * x + 9 ≠ 0        (2 )

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    From inequality(1)：
         -3 ≤ a ≤ 1 或  1 ≤ a ≤ 1 或  a ≥ 1
    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)
         -3 ≤ a ≤ 1 或  1 ≤ a ≤ 1 或  a ≥ 1    (3)

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    The final solution set is :
         -3 ≤ a ≤ 1 或  1 ≤ a ≤ 1 或  a ≥ 1

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