(360-270)/(50-5)×(24.2-5)+270
    0.7×1.71×10^(-3)×880×800
    0.25×1.0×19.1×10^(-3)×880×800
    0.667×0.0191×0.78539816×0.5×((sin1.31)^3)/3.14+0.360×0.00981748×0.4375×2×(sin1.31)/3.14
    2/3×19.1×10^3×785398.16×10^(-6)×0.5×(sin1.31)^3/3.14+360×10^3×9817.48×10^(-6)×0.4375×(sin1.31+sin1.31)/3.14
    (2×50.3)/(600×150)
    0.7×1.43×600×565
    0.25×1.0×14.3×600×565
    1/2×（11.25+10）×8
    (600-35)/600
    (0.7-0.4)×0.5×35.54
    (0.7-0.4)×0.5×44.63=
    2.5×2×3.30+2×2×4.76
    2.5×(2×4.41+9.03+2×3.30)
    2.5×(2×4.41+9.03)
    (0.6-0.4)×0.5×8.033
    0.45×2×(3.30+4.76)
    0.45×(2×4.41+9.03+2×3.30)
     0.45×(2×4.41+9.03)
     2.5×2×(3.30+4.76)

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