ln(y)=-ln((1-1)+0.8769*1)-1*(0.1654/(1+(1-1)*0.1654)-0.8769/((1-1)+1*0.8769))
    3500*(1+x)^5=5898
    log(y)=-log((1-1)+0.8769*1)-1*(0.1654/(1+(1-1)*0.1654)-0.8769/((1-1)+1*0.8769))
    101.3=1*1*e^(16.8967-3803.98/(t+273.15-41.68))+(1-1)*2.627*e^(16.2884-3816.44/(t+273.15-46.13))
     y=(0.9*1.007*e^(16.8967-3803.98/(78.141+273.15-41.68)))/101.3
    101.3=0.9*1.007*e^(16.8967-3803.98/(t+273.15-41.68))+(1-0.9)*2.322*e^(16.2884-3816.44/(t+273.15-46.13))
     y=(0.8*1.028*e^(16.8967-3803.98/(78.273+273.15-41.68)))/101.3
    101.3=0.8*1.028*e^(16.8967-3803.98/(t+273.15-41.68))+(1-0.8)*2.061*e^(16.2884-3816.44/(t+273.15-46.13))
    X*7%/{(1+7%)^3-1}=2000
    X*7%/{(1+7%)^3-1}
    x^2-15x=31
    2x（60-X）-4X=30
     y=(0.7*1.069*e^(16.8967-3803.98/(78.614+273.15-41.68)))/101.3
    101.3=0.7*1.069*e^(16.8967-3803.98/(t+273.15-41.68))+(1-0.7)*1.836*e^(16.2884-3816.44/(t+273.15-46.13))
     x-25=x÷4
     y=(0.6*1.135*e^(16.8967-3803.98/(79.151+273.15-41.68)))/101.3
    45.8+45.8x＝70.2
    101.3=0.6*1.135*e^(16.8967-3803.98/(t+273.15-41.68))+(1-0.6)*1.642*e^(16.2884-3816.44/(t+273.15-46.13))
    lnx=0.458
    1.22^x=3.5

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