π(48/2)^2-π(40/2)^2
    π(48.3/2)^2-π(40/2)^2
    π(47.6/2)^2-π(40/2)^2
    (28.578×16×14.720+48×25.804)/(28.578×(16+19)+20)
    18*63
    π(48.3/2)^2-π(40.3/2)^2
    (10.7×0.9+11.4×8.4+11.5×6.7)/16
    5.06×(3.6/2×3.6/2+3.6×3.45)=
    (18.7×3.9+19×5.3+9.4×1.4+10.1×3.1+10.7×6.2+8.4×11.4+11.5×6.7)/16
    (88+(160-88)/(500000-100000)*(268129.881-100000))*1.0*1.0
    （88+（160-88）/（500000-100000）*（268129.881-100000）*1.0*1.0
    4.05×[(3.6/2×3.6/2+3.6×3.45)+(3.6×3-0.5×3×0.5×3)]=
    5.06×[(3.6/2×3.6/2+3.6×3.45)+(3.6×3-0.5×3×0.5×3)]=
    (18.3+18.7*3.5+18.9*7.1+19.5*7.7+20.2*6.7)/26
    (18.3+18.7*3.5+18.9*7.1+19.5*7.7+20.2*6.7)26
    1719.83*9.44+3611.29*3.03+122.15*24+373.47*19.5-1.25(1656.36*14.11+1144.37*3.15)
    cos48
    1.12➗1.6=
     914.43*8.57+468.56*2.32-122.15*15.09-373.47*10.59-931.15*1.97
    914.43*8.57+468.56*2.32-177.67*15.09-274.35*10.59-931.15*1.97

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