(x-x/1.09*0.03)*0.02=77467.52
    x（x+1）+2x
    (x+1)*(e^x)*(1.819*10^(-12))=(1.819*10^(-12)+0.095
    (x+1)*(e^x)*0.01819 = 0.095+0.01819
    (1+x)*0.01819*ex = 0.095
    (1+x)*0.01819*((e^x)-1) = 0.095
    （8-a）（200十50a）=1750
    d^2+d-11=0
    3d^2+300d+5000=0
    1/d+1/（d+1）+1/（d+5）=1/（d+2）
    64x^3+32x^2-76x-20=0
    （26.127+x）×0.85＝52.254+67.181-x
    （26.127+x）×0.85＝52.254+68.181-x
    （26.127+x）×0.85＝52.254+69.181-x
    （26.127+x）×0.85＝52.254+70.181-x
    （26.127+x）×0.85＝52.254+71.181-x
    （26.127+x）×0.85＝52.254+72.181-x
    16=sqrt(16x^2+x^4)
    e^(-3.14x/(sqrt(1-x^2)))=0.163
    20x = 32^x

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