xtanx=4.285714286
    (3578.5-400)*((1+x)^25-1)/x/(1+x)^25/(1+x)^25-4205-4169/(1+x)-4254/(1+x)^2-4127/(1+x)^3-3521/(1+x)^4=0
    （4210-400）*（（1+x）^25-1）/x/(1+x)^25/(1+x)^25-4625.5-4585.9/(1+x)-4679.4/(1+x)^2-4539.7/(1+x)^3-3873.1/(1+x)^4=0
    （4210-400）*（（1+x）^25-1）/x/(1+x)^25/(1+x)^25-4205-4169/(1+x)-4254/(1+x)^2-4127/(1+x)^3-3521/(1+x)^4=0
    xtanx=1.428571429
    xtanx=2.857142857
    x^5-0.0242×0.000625x^2-0.05×0.0242x-0.0242 = 0
    x^5-0.1295×0.000625x^2-0.05×0.1295x-0.1295=0
    x^5-0.0155×0.000625x^2-0.05×0.0155x-0.0155=0
    x^2=0
    90.7029=50/(1+x)^1+50/(1+x)^2+100/(1+x)^2
    90.7029=50/(1+x)^1+50/(1+x)^2+100/(1+x)^2
    90.7029=50/(1+x)^1+50/(1+x)^2+100/(1+x)^2
    90.7029=50/(1+x)^1+50/(1+x)^2+100/(1+x)^2
    90.7029=50/(1+x)^1+50/(1+x)^2+100/(1+x)^2
    90.7029=50/(1+x)^1+50/(1+x)^2+100/(1+x)^2
    90.7029=50/(1+x)^1+50/(1+x)^2+100/(1+x)^2
    90.7029=50/(1+x)^1+50/(1+x)^2+100/(1+x)^2
    90.7029=50/(1+x)^1+50/(1+x)^2+100/(1+x)^2
    90.7029=50/(1+x)^1+50/(1+x)^2+100/(1+x)^2

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