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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 49×k^2+56×k-4 >0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        49 × k ^ 2 + 56 × k - 4 >0         (1)

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    From inequality(1)：
         k < -1.210305 或  k ＞ 0.067448

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    The final solution set is :
         k < -1.210305 或  k ＞ 0.067448

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