Overview: 2 questions will be solved this time.Among them
           ☆1 equations
           ☆1 calculations of prime factor

[ 1/2 Equation]
    Work: Find the solution of equation 40000×（1+r）^(-1)+40000×（1+r）^(-2)+40000×（1+r）^(-3) = 0 .
    Question type: Equation
    Solution:
    the solutions is:
        r=-1, it is the incremental root of the eqution.    
    There are 1 solution(s).
    There is(are) 1 additive root(s) and 0 real solutions.(Note:additive root, generated by computer, but not suitable for this equation.)


解方程的详细方法请参阅：《方程的解法》
[2/2 Digtal analysis]
    Work：Break 1020000 into prime factors.
    Question type: Resolving prime factor
    Solution:
        1020000=2*2*2*2*2*3*5*5*5*5*17
    *Note: 1020000 has 11 prime factors.

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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：语法错误(1): +40000×（1+r）^(-4)+40000（1+r）^(-5)+1000000×（1+r）^(-5)
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