160*0.125*1/2+248*0.125*2/3
    36.79*8.73+109.31*6.56+16.28*4+164.03*1.99-119.26*7.96-188.36*3.96
    （450
    36.79*8.73+109.31*6.56+16.28*4+164.03*1.99-119.26*7.96-268.40*3.96
    5.5^3
    62.033/50
    14/((0.1*1.1^8)/(1.1^8-1))-35-35*(1/1.1)^4
    14/((0.1*1.1^8)/(1.1^8-1))-35-35*(0.1*1.1^4)/(1.1^4-1)
    4.144/3×(2×106.906+159.875)/(106.906+159.875)
    1/2×(106.906+159.875)×4.144=
    106.906+12.782×4.144
    62.033*(0.1*1.1^8)/(1.1^8-1)
    62.033*(1.1^8-1)/(0.1*1.1^8)
    0.841/3×(2×106.906+117.656)/(106.906+117.656)
    1/2×(106.906+117.656 )×0.841
    106.906+12.782×0.841
    1.5×2.1×0.5×30
    16.302+1.89+1.512=
    2.4×2.1×0.15×2
    1.5×2.1×0.15×4

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