tanπ
    (8.63*18.74+8.7*15.23+857.86*10.5+679.47*3.33)/ 1554.66
    (1.95+1.95)×0.65×0.87=
    7.9*0.7
    26.71*0.7
    （8+（12-8）÷（50000-10000）×（17744.42-10000））×1.0×0.9
    （22.4+（60-22.4）÷（50000-10000）×（17744.42-10000））×1.0×0.9
    （8.63*11.86+8.7*8.17+857.86*3.44+22.35*0.17-111.1*10.14-2.31*0.017）/5.64
    7.43*0.7
    22.34×0.7
    7.431468*0.7
    （8+（12-8）÷（50000-10000）×（12571.87-10000））×1.0×0.9
     (8+(12-8)/(50000-10000)*(12571.87-10000))*1.0*0.9*0.7
    （8+（12-8）/（50000-10000）*（12571.87-10000））*1.0*0.8*0.7
    2×(3.6/2×3.6/2+3.6×3.45)=
    0.65×(3.6/2×3.6/2+3.6×3.45)=
    2×(3.6/2×3.6/2+3.6×3.45)+2.5×(3.6×3-0.5×3×0.5×3)=
    0.65×[(3.6/2×3.6/2+3.6×3.45)+(3.6×3-0.5×3×0.5×3)]=
    0.65×[(3.9/2×3.9/2+3.9×3.6)+(3.9×3-0.5×3×0.5×3)]=
    0.65×[(3.9/2×3.9/2+3.9×3.75)+(3.9×3-0.5×3×0.5×3)]=

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