x/(x+100)=2.13
    -5 = -0.3x+0.014x^2-0.003x^3
    -3 = -0.3x+0.014x^2-0.003x^3
    -1=-0.3x+0.014x^2-0.003x^3
     -5 = -0.46x-0.005x^2
     -3 = -0.46x-0.005x^2
    -5 = -0.41x-0.004x^2
    -3 = -0.41x-0.004x^2
    -1=-0.41x-0.004x^2
    -1=0.41x-0.004x^2
    -5 = -0.43x-0.018x^2
    -3 = -0.43x-0.018x^2
    -1=-0.43x-0.018x^2
    -1=-0.46x-0.005x^2
    -1=-0.43*（x/（x+100））-0.018*（x/（x+100））*（x/（x+100））
    0=3x+8
    -1=-0.43*（x/（x+100））-0.018*（x/（x+100））（x/（x+100））
    0.4*X=900
    n（n+1）=210
    x/（1+6.5%）=8000

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