4.17×10^6 /（300×0.95×80）
    3.59×10^6 /（300×0.95×80）
    4.6+4.3+1.86-5.1
    0.8×2.83×10^6 /（300×0.95×70）
    4.6+4.3+1.86-2.8
    (2×40.539+60.67)/(3×(40.539+60.67))×1.86
    2.40×10^6 /（300×0.95×70）
    (2×47.539+95.277)/(3×(47.539+95.277))×4.3+1.86
    1/3(4.6-(-0.651))+(4.3+1.86)
    (2×106.633+178.85)/(3×(106.633+178.85))×1.86
    (2×30.72+27.74)/(3×(30.74+27.74))×(4.6+4.3-8.5)+1.86
    (106.633+178.85)/2×1.86
    40.534*1.86+5.412*1.86*1.86
    106.633+38.827*1.86
    40.534+10.824*1.86
    (169.5×7.65+307.054×3.51+78.709×0.753)-(-2.924×1.55+191.013×0.74+193.191×7.7+109.24×5.4
    (169.5×7.65+307.054×3.51+78.709×0.753)
    64.559/2×(4.6-(-0.651))+(47.539+95.277)/2×4.3
    (30.72+42.64)/2×(4.6+4.3-8.5)
    18.2×(4.6+4.3-8.5)×1.638+2×12×1.28

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