26.87*72*0.0028
    （29.76-17.86）/29.76
    （29.76-8.43）/29.76
    （29.76-14.38）/29.76
    （29.76-22.32）/29.76
    18.33*72*0.0028
    8.67*72*0.0028
    14.33*72*0.0028
    22.33*72*0.0028
    29.5*72*0.0028
    24*3
    2√18÷3√12
    (598911430.26-1491746.60-5000-716044.35)*.0025=
    log(2,3)+log(3,2)
    -53/42
    0.32*21/19
    -0.3*53/42+0.7
    0.3*53/42+0.7
    0.33+1.62-0.67
    0.53*53/42

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