Overview: 6 questions will be solved this time.Among them
           ☆3 inequalities
           ☆2 equations
           ☆1 arithmetic calculations

[1/6 Formula]
    Work: Calculate the value of equation (-2)^2+6/(-3)-sqrt(9)+(-0.1)^0 .
    Question type: Mathematical calculation
    Solution:
          (-2)^2+6/(-3)-sqrt(9)+(-0.1)^0
        =-2^2+6/(-3)-sqrt(9)+(-0.1)^0
        =-2^2+6/(-3)-sqrt(9)+(-0.1)^0
        =-2^2+6/(-3)-sqrt9+(-0.1)^0
        =-2^2+6/(-3)-sqrt9+(-0.1)^0
        =-2^2+6/-3-3+-0.1^0
        =4+6/(-3)-3+(-0.1)^0
        =4+6/(-3)-3+1
        =4+(-2)-3+1
        =2-3+1
        =-1+1
        =0
    Answer:(-2)^2+6/(-3)-sqrt(9)+(-0.1)^0=0
[ 2/6Inequality]
    Assignment:Find the solution set of inequality x^2-x ≤2 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         x ^ 2 - x ≤2         (1)

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    From inequality(1)：
         -1 ≤ x ≤ 2

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    The final solution set is :
         -1 ≤ x ≤ 2
[ 3/6 Equation]
    Work: Find the solution of equation x^3-2*x = 1 .
    Question type: Equation
    Solution:
    After the equation is converted into a general formula, there is a common factor:
    ( x + 1 )
    From
        x + 1 = 0
    it is concluded that:：
        x₁=-1
    Solutions that cannot be obtained by factorization:
        x₂≈-0.618034 , keep 6 decimal places
        x₃≈1.618034 , keep 6 decimal places    
    There are 3 solution(s).

解程的详细方法请参阅：《方程的解法》
[ 4/6 Equation]
    Work: Find the solution of equation x^ln(x) = 4 .
    Question type: Equation
    Solution:
    The solution of the equation:
        x₁≈0.308076 , keep 6 decimal places
        x₂≈3.245956 , keep 6 decimal places    
    There are 2 solution(s).

解程的详细方法请参阅：《方程的解法》
[ 5/6Inequality]
    Assignment:Find the solution set of inequality x+2 ≥2*x .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         x + 2 ≥2 * x         (1)

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    From inequality(1)：
         x ≤ 2

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    The final solution set is :
         x ≤ 2
[ 6/6Inequality]
    Assignment:Find the solution set of inequality 1/x ≤1 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        1 / x ≤1         (1)
        From the definition field of divisor
        x ≠ 0        (2 )

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    From inequality(1)：
         x ≤ 0 或  x ≥ 1
    From inequality(2)：
         x < 0 或  x ＞ 0

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    From inequalities (1) and (2)
         x < 0 或  x ≥ 1    (3)

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    The final solution set is :
         x < 0 或  x ≥ 1

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