(4.63×1.05+1395.94×10.004)/(1395.94+4.63)
    2/3×14.4×(2×8.16+185.72)/(8.16+185.72)
    ((8.16+185.72)×14.4)/2
    (464.72×10.68)/(423.21×9.93)
    (441.35×10.68)/(423.21×9.93)
    (11.1×1.05+410.28×10.18)/(410.28+11.1)
    ((8.16+187.21)×4.2)/2=
    (33.1×9.5×2.145+16×2.67)/(33.10×6+20)
    ((2×4.5+0.8×15.9)×7.41)/((6.3-0.5)×10)=
    ((2×4.5+0.8×15.4)×7.41)/((6.3-0.5)×10)
    ((2×4.5+0.8×15.5)×7.41)/((6.3-0.5)×10)
    (22.44×5.3×2.145+16×2.67)/(22.44×6)
    (22.44×5.3×2.145+16×2.67)/(22.44×13)
    (33.1×5.3×2.145+16×2.67)/(33.10×13)
    (0.5×18.5+4.1*20+2.9*19.1)/6
    (10.0×9.5×2.246+16×3.84)/(10.0×6+20)
    (22.0×9.5×2.246+16×3.84)/(22.0×6+20)
    (33.1×9.5×2.246+16×3.84)/(33.10×6+20)
    (0.5*18.5+2.7*19.4+1.3*19.5+6*18.6)/6
    (19.7×8.5×2.145+16×2.67)/(19.7×6+20)

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