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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 80r^2-13+85r >0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        80 * r ^ 2 - 13 + 85 * r >0         (1)

---

    From inequality(1)：
         r < -1.198128 或  r ＞ 0.135628

---

    The final solution set is :
         r < -1.198128 或  r ＞ 0.135628

Your problem has not been solved here? Please take a look at the  hot problems ！