(19.19×6.65×3.19+14×3.50)/(19.24×(5.35+6.65)+26.73)
    (19.19×6.65×3.19+14×1.90)/(19.24×(5.35+6.65)+26.73)
    (19.19×6.65×2.19+14×1.90)/(19.24×(5.35+6.65)+26.73)
    (19.19×6.65×2.16+14×1.90)/(19.24×(5.35+6.65)+26.73)
    25×6.29×0.7
    1/139
    1111111111111111111111/513239
    121*23*4093*8779*21649*513239
    0.75×1860×140
    65-31.6/2-13.9
    (2×200.91)/(5×10)
    233.61×0.86
    (0.33×20×20×1770)/1000
    ［1748×（1+0.054）×1.1589×1.223+0］×0.9903
    ［1748×（1+0.054）×1.1589×1+0］×0.9883
    ［1-1/（1+8.0%）^53.52］/［1-1/（1+8.0%）^70］
    58.14+19.3×3.56
    6.84+19.0×2.7
    0+17.5×0.391
    (251.72-10.26×10)×0.307-2×0×0.307+10.26×10

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