2.64-2.31+1.24+0.17+0
    (221.38+846.21+57.84)*10^3*(564.6-250)/223405991568.39
    67.02*10^6*(608.9-250)/206592415464.42
    718.32*10^6*(590.4-250)/197925113037.83
    1714.03*10^3*782.6*(590.4-250)/197925113037.83
    1714.03*10^3/649036.798
    (x-2)+(x+2)+(2x)+(0.5x)=45
    ((1105.55*1668*0.9923+1105.55*0)*(1009.6-215.5)-113.78*1018*(1009.6-45))/(1714.03*10^3)
    sin12.145
    √(441/400)
    (5268220-a)/a=1.66
    (5268220-x)/x=1.66
    lne^x^2
    118.37+8.9
    （2100*12*90%-70%*110X*6.31%）/(30%*110X+5%*110X)=3.8%
    1600*150*(590.4-150/2)+1/2*(1600-200)*100*(590.4-150-100/3)+200*100*(590.4-180-100/2)
    x/(4000+0.12x) = 2
    (1141.26*1668*(1010.9-100)-113.78*1018*(1010.9-45))/(1141.26*1668-113.78*1018)
    1600-589.1
    1800-1223

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