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    x=1+(9/10)
    (x-35)(400+20(58-x))=8400
    2.7*(2.08*10^-5)^0.313*1.017^0.687*x^1.687+18*2.08*10^-5*x-(1600-1.017)*9.8*(0.3*10^-3)^2=0
    (x-35)(400+20(x-58))=8400
    5.142*(4.22+t)^2*(2.31+2/3*t)-20.07*t^2*(3.72+2/3*t)=0
    1/x+1/(x+2)=1/(x-1)
    202.6a²(1-a)/(1+a)=0.000000008
    202.6a²(1-a)/(1+a)=8*1000000000
    x乘2x-3
    0.25*x^4-20/3*x^3+50*x^2=791.67
    x乘2x
    202.6a²(1-a)/(1+a)
    0.25*x^4-20/3*x^3+50x=791.67
    x+1
    (x+1)(2x-3)
     (sales*125000-17.35*125000-485000)*(1-21%)+910000/5*21% = 252672.7926
    (0.0545-2x)*(0.0545-2x)=54.5*(x+0.006)*(x+0.0009)
    (0.0545-2x)*(0.0545-2x)=54.5*(x+0.006)*(x+0.0009)
     (sales*125000-17.35*125000-485000)*(1-21%)+910000/5*21% = 910,828.869624
     (sales*125000-17.35*125000-485000)*(1-21%)+165000*21% = 910,828.869624

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