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

[ 1/1Inequality]
    Assignment:Find the solution set of inequality 4/7 ≤x×x-2x+4 ≤7 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        4 / 7 ≤ x × x - 2 * x + 4         (1)
         x × x - 2 * x + 4 ≤7         (2)

---

    From inequality(1)：
         x ∈ R (R is all real numbers),that is, in the real number range, the inequality is always established!
    From inequality(2)：
         -1 ≤ x ≤ 3

---

    From inequalities (1) and (2)
         -1 ≤ x ≤ 3    (3)

---

    The final solution set is :
         -1 ≤ x ≤ 3

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