-5.9524x^2+10.548x-4.0286
    450-36
    2.46*x/(1+1.46x)=0.544
    2.46*x/(1+1.46x)=0.61
    (e^x)
    20+11+8+12.5
    2.46*x/(1+1.46x)=0.73
    (e^2x)
    [(1+r)^60-(1+r)^30]/r=127.9
    e^2x=
    e^2x
    0.4t^3+0.9t^2=30
    2*10/（2-x）+1.5*20/(1.5-x)+1.2*10/(1.2-x)+1*60/(1-x)=0
    876.33/250*460
    {（1+r）^61-1}/r=128.9
    14.3*250*87.34=360x
    x/((0.0462-x)*(0.1346-2x)^2) = 1.26*10^21
    600-(30-2x)(20-2x)＝400
    x/((0.0462-x)*(0.1346-2x)^2) = 1.26*10^
    2=-x^(2)+7x-10

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