54.650×16.550=
    13.850×54.650×2+2.7×54.650×2.5=
    90.628×27.179+393.235×21.979+483.047×16.979+458.422×11.979+20.743×7.979+2087.847×2.793
    16550-2700
    140.556×24.942+300.844×20.568+136.212×17.653+294.877×15.32+908.486×10.5+1006.785×3.566
    (((0.78+0.68)*(0.8+0.48)/2)
    (((0.78+0.68)*0.8+0.48)/2)
    7*12*2
    160^20
    0.585786*0.585786*0.585786+(4-0.585786)^3
    0.0076×21.15^-1/12×(9.81×3000/21.15^2)^1/3×21.15^2/9.81
    0.00076×21.15^-1/12×(9.81×3000/21.15^2)^1/3×21.15^2/9.81
    0.00076×21.15^-1/12×（9.81×3000/21.15）^1/3×21.15^2/9.81
    7.679/3×(2×49.485+494.296 )/(49.485+494.296 )
    1/2×(49.485+494.296)×7.679
    49.485+57.9256×7.679
    7.679/3×(2×179.457+277.082)/(179.457+277.082)
    179.457+12.7132×7.679
    90.628+393.235+483.047+458.422
     140.556+300.844+136.212+294.877+908.486+1955.961

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