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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 180+56.4-1.8*9+56.4-1.8*10+...+56.4-1.8*20+20(x-20) >= 800*79% .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        180 + 56.4 - 1.8 * 9 + 56.4 - 1.8 * 10 + 0.| + 56.4 - 1.8 * 20 + 20 * ( x - 20 ) >= 800 * 79 %         (1)

---

    From inequality(1)：
         x ≥ 753/20

---

    The final solution set is :
         x ≥ 753/20

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