5.2842=（（28.02*0.639（x+0.1））/（1+0.639（x+0.1））*（（100-6.66-1.14）/100）*（1/(1+0.31*1.14)）+（（0.76（x+0.1））/（1.3*0.101325））
    3t^2-24t+32=0
    e∧x
    2d^3+11d^2+20d+8=0
    15.2=((0.01*x^1.85+0.25*1042.05)^0.5)*x^0.78
    152=((0.01*x^1.85+0.25*1042.05)^0.5)*x^0.78
    152=(0.01*x^1.85+0.25*1042.05)^0.5*x^0.78
    152=(0.01*x^2.63+0.25*1042.05*x^0.78)
    xxx+x-2=0
    x=98350+0.01x+(0.01x*0.1)
    x/0.05×2=4500-x/0.02×4
     [（774+x）+487]/(896+x）=0.46
     （774+x）+487/(896+x）=0.46
     （774+x）+487/(896+x）=28
    1-（1-x）^2/3
    （x-1.394）*300-0.1=1
    √x
    x*ln(x/0.045)=0.235
    x*ln(x/0.045)=0.0217
    x*ln（x/45）=0.0217

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