Overview: 4 questions will be solved this time.Among them
           ☆4 inequalities

[ 1/4Inequality]
    Assignment:Find the solution set of inequality x2+x3+x4 >= 4 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         x * 2 + x * 3 + x * 4 >= 4         (1)

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    From inequality(1)：
         x ≥ 4/9

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    The final solution set is :
         x ≥ 4/9
[ 2/4Inequality]
    Assignment:Find the solution set of inequality x1+x2+x3+x4+x5 <= 10 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         x * 1 + x * 2 + x * 3 + x * 4 + x * 5 <= 10         (1)

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    From inequality(1)：
         x ≤ 2/3

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    The final solution set is :
         x ≤ 2/3
[ 3/4Inequality]
    Assignment:Find the solution set of inequality 6*x1+6*x2-4*x3-4*x4+36*x5 <= 0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        6 * x * 1 + 6 * x * 2 - 4 * x * 3 - 4 * x * 4 + 36 * x * 5 <= 0         (1)

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    From inequality(1)：
         x ≤ 0

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    The final solution set is :
         x ≤ 0
[ 4/4Inequality]
    Assignment:Find the solution set of inequality 4*x1+10*x2-x3-2*x4-3*x5 <= 0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        4 * x * 1 + 10 * x * 2 - x * 3 - 2 * x * 4 - 3 * x * 5 <= 0         (1)

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    From inequality(1)：
         x ≥ 0

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    The final solution set is :
         x ≥ 0

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