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

[1/3 Formula]
    Work: Calculate the value of equation lg2+ln5 .
    Question type: Mathematical calculation
    Solution:
          lg2+ln5
        =0.30103+ln5
        =0.30103+1.609438
        =1.910468
    Answer:lg2+ln5=1.910468
[ 2/3 Equation]
    Work: Find the solution of equation lgx+lnx = 0 .
    Question type: Equation
    Solution:
    the solutions is:
        x=1    
    There are 1 solution(s).

解方程的详细方法请参阅：《方程的解法》
[ 3/3Inequality]
    Assignment:Find the solution set of inequality lgx+lnx <0 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
         lg x + ln x <0         (1)
        From the definition field of lg
        x > 0        (2 )
        From the definition field of ln
        x > 0        (3 )

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    From inequality(1)：
         x < 1
    From inequality(2)：
         x ＞ 0
    From inequality(3)：
         x ＞ 0

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    From inequalities (1) and (2)
         0 < x < 1     (4)
    From inequalities (3) and (4)
         0 < x < 1     (5)

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    The final solution set is :
         0 < x < 1

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