x^3-7x^2+15x-9=0
    2000/（2000/x）=2
    x^3-7x^2+15x-1=0
    （100-2x）（40-2x）=1216
    （1+x/4）^4=1.1025
    n(n-1)=110
    n(n-1)=220
    （7.13-x）/x=15.7
    0.15=e^（-10k）+e^（-7k）+e^（-3k）
    4.61833=16.5092-［3578.91/（x+222.65）］
    4.61833=16.5092-（3578.91/x+222.65）
    ln101.325=16.5092-3578.91÷(x+222.65)
    －x²－64x+16=0
    ln101.325=16.5092-(3578.91÷x+222.65)
    3.6-x=0.85
    0.187 = 0.137z^{-3} + 0.119z^{-2} + 0.269z^{-1}
    0.453 = 0.137z^{-3} + 0.119z^{-2} + 0.269z^{-1}
    x^0.52=15.429/0.1560
    x^0.52=15.781÷0.156
    x0.52=100

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