3/4+1/6-2/3
    3/4+1/6-2/3
    3/4+1/6-2/3
    1/12 +2/3-1/4
    0.352778*60=
    0.352778*60=
    84.7/36=
    84.7/36=
    25+59.7=
    0.207792*60=
    85/38.5=
    0.828571*60=
    70.4/38.5=
    70.4/38.5=
    0.849351*60=
    109.7/38.5=
    58+48.4+3.3=
    （160*6.93-25*13.07）/13.11=
    236.5-54-4-68.5-85=
    140*7.92/13.07=

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