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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality d^2+21 >10d .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         d ^ 2 + 21 >10 * d         (1)

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    From inequality(1)：
         d < 3 或  d ＞ 7

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    The final solution set is :
         d < 3 或  d ＞ 7

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