51.5=(0.109^2)/(x-0.218)
    15.31x^3+93.59x^2-103.52x-1740.26=0
    （230+x）/（400+x）=0.66
    15.31x^3+99.65x^2-28.88x-1184.79=0
    15.31x^3+105.72x^2+45.76x-743.37=0
    2015
    15.31x^3+134.75x^2+150.5x-516.24=0
    k^(2)-7k=6
    85 = (x^2)/(0.100-x)^2
    5 = (x^2)/((0.100-x)^2)
    85=(x^2)/(0.100-x)^2
    (N-7)/(N+1)=0.75-0.75×（0.322）*0.5668
    x^4+6x^3-3x^2-2x+2=0
    x^4+6x^3-3x^2-2x-2=0
    5/8x=1/12
    9X^ 2—11X—27=0
    9X2—11X—27=0
    （21600/2）^2+(r-2540)^2=r^2
    （3000-4x）x^(2)=238515060
    5.9%/12×(1+5.9%/12)^240/[(1+5.9%/12)^240-1]×500000

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