-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
    x-x*（1-20%）*20%=8000
    x/（1+6.5%）=x-x*（1-20%）*30%+2000
    x(25+1-2x)=80
    x^6 - 8x^5 + 5x^4 + 72x^3 - 85x^2 - 128x + 79 = 0
    (x-1)（x²-2x-1）=-16
    x^2/（100-x）=0.1311

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