Overview: 3 questions will be solved this time.Among them
           ☆3 inequalities

[ 1/3Inequality]
    Assignment:Find the solution set of inequality 20 ≤X ≤200 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        20 ≤ x         (1)
         x ≤200         (2)

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    From inequality(1)：
         x ≥ 20
    From inequality(2)：
         x ≤ 200

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    From inequalities (1) and (2)
         20 ≤ x ≤ 200    (3)

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    The final solution set is :
         20 ≤ x ≤ 200
[ 2/3Inequality]
    Assignment:Find the solution set of inequality 20 ≤Y ≤200 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        20 ≤ Y         (1)
         Y ≤200         (2)

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    From inequality(1)：
         Y ≥ 20
    From inequality(2)：
         Y ≤ 200

---

    From inequalities (1) and (2)
         20 ≤ Y ≤ 200    (3)

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    The final solution set is :
         20 ≤ Y ≤ 200
[ 3/3Inequality]
    Assignment:Find the solution set of inequality 20 ≤Z ≤200 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 2 inequalities：
        20 ≤ Z         (1)
         Z ≤200         (2)

---

    From inequality(1)：
         Z ≥ 20
    From inequality(2)：
         Z ≤ 200

---

    From inequalities (1) and (2)
         20 ≤ Z ≤ 200    (3)

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    The final solution set is :
         20 ≤ Z ≤ 200

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以下题目输入有误或有空行，请仔细检查，改正后再计算：
1==>错误类型：不等式含有多元未知数(8): 60.5≤X+Y+Z≤61
解多元方程，请点击多元方程
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