253*395256917
    127*87489
    1/137
    C(7,3)
    C(8,3)
    C(6,3)
    C(9,3)
    （179.9-149.9/160*120）/60
    (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

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