(π(48.5/2)^2-π(40/2)^2)*138*7.93/1000
    (π(48.3/2)^2-π(40/2)^2)*138*7.93/1000
    (π(48.3/2)^2-π(40/2)^2)*138*7.93
    (π(48.3/2)^2-π(40/2)^2)*138000*7.93
    94.6*0.8
    (88+(160-88)/(500000-100000)*(268129.881-100000))*1.0*0.8
    (π(48/2)^2-π(40/2)^2)*138000*7.93
    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)]=

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