（x/2×2+3-9×1-4×9÷9+9-3+4）×2-（1×2×3+1）×20
    (0.9*(1.95*10^5*2*10^-4+5.65*11.10*1.70))/(1+15*0.003708*2.73)
    (1+919.75^2)/( 224.135*10^9/724430.602)
    (224863173479.48+223405991568.39)/2
    (955.0+884.5)/2
    (1668*819.8+1018*990.5)/( 1668+1018)
    (1668*934.2+1018*989.2)/(1668+1018)
    1190.2-974.2
    1133.1^2
    (1668+1018)/724430.602
    (12.35+9.85)/2
    (2084.10*10^3/649036.798+2084.10*10^3*794.0^2/197925113037.83)-1342.28/249272647.7-1.25/1.70*613.73/272503226.2
    (1395-54.13-76.91-14.50)*1668
    (2143.67*10^3/649036.798+2143.67*10^3*910.9^2/196520580896.62)- 1342.28/215746827.5-1.25/ 1.70*613.73/240713919.4
    (1395-95.33-0-14.5)*1668
    (1395-92.77-0-28.32)
    ( 1395-92.77-0-28.32)*2502
    ( 1395 -92.77 -0-28.32) x 2502
    1800-250-175-200
    300+200+1550+200

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