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    262.74×8.02+496.33×3.02-1.38×9.18-757.95×3.39=
    4/(x^2)+4/x+1=0
    4/(x^2)+4 /x+1=0
    3/(x^2)+3/x+1=0
    x^4-4*x^3-11*x^2+24x+80
    1.379397*0.48827/(1+1.379397x)-0.036878*0.211/(1-0.036878x)-0.588722*0.30142/(1-0.588722x)=0
    262.74+496.33=1.38+6.97t^2+21.16t
    e(-x)=25.57x
    e-x=25.57x
    ex=x
    1/s+1/(s+2)+1/(s+3)=1/(s+5)
    s^3+10*s^2+15*s+15=0
    8(1-0.5x)(1+x)+9(1+2x)=18(1+16/15x)
    8(1-0.5x)(1+x)+9(1+2x)=18(1+16/15)
    223.04×16.01+565.32×11.01+4.82×6.01+687.23×3.28+398.45×0.59-0.002×16.92-1002.21×9.87-746.64×3.36-130.05×0.59
    276.12×15.64+491.28×10.64+357.47×4.16+234.98×2.16+451.15×0.75-0.02×17.16-942.23×10.37-536.93×4.56-164.72×2.18-167.88×0.75=
    0.6*(1+x)/[12*(1-6%)]+x = 11%
    0.6*(1+x)/12*(1-6%)+x=11%
    1000(1+i)^2=25(1+i)^2+80.64(1+i)+1088.64
    975(1+i)^2=80*(1+i)+1088.64

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