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    2^-2
    (18.0×2+3×17.8+5.3×19.6+1.8×18.1+13.1×19.4)/25.2=
    7932.25×5.10+230.25×24.5+545.25×19.5-1.25(33.72×24.77+149.63×22.3+476.05×17.99+246.47×14.78+3858.33×6.60)=
    7932.25×5.10+230.25×24.5+545.25×19.5-1.25(33.72×24.77+149.63×22.3+476.05×17.99+246.47×14.78+3458.33×6.60)=
    9530.4×3.23+225.36×24.5+583.66×19-1.25(13.92×25.43+125.22×23.41+517.47×18.39+186.84×14.98+3741.83×5.12)=
    8932.75×5.10+230.25×24.5+545.25×19.5-1.25(33.72×24.77+149.63×22.3+476.05×17.99+246.47×14.78+3458.33×6.60)=
    3219.64×5.1+225.36×24.5+583.66×19-1.25(13.92×25.43+125.22×23.41+517.47×18.39+186.84×14.98+2896.90×6.79)=
    60000+30000+240000+20000+2500+2500+5000+10000+15000+15000+70000+100000+70000+70000
    3/2*(51-40)*(51-40-1)+12*13+1/2*(40-12)*(40-12-1)
    1.5*(51-40)*(51-40-1)+12*13+0.5*(40-12)*(40-12-1)
    2433862.43 + 18268571.40
    3285714.28* 5.56
    18.4/2.3
     3285714.28 /1.35
     2300000/(0.7*1)
    2300000/(0.7*1*8388)
    187.5/2/3
    21780×(1+10%)
    33000*2
    20.2×50.1(1-50.1/11.1×0.2147×0.5203)

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