[1.0×(0.71+0.89+2.13+39)×1.7+1.2×0.64]/2
    [1.0×(2.5+2+2)×1.7]/2
    C(60, 9)
    (3.8/2000)*1000
    (3.8/470)*1000
    3.8/470
    3.8/2000
    (470*2000)/(470+2000)
    80×2^(1+2)
    2-2
    4746700/(1.0×237000×215)
    2890125/(0.92×237000×215)
    (17969×133940)/(23700000×8)
    4746700/(1.05×237000)
    1.0×(2.5+2+2)×0.35
    1.0×(0.71+0.89+2.13)×0.35
    1.0×(2.5+2+2)×0.35
    1.0×(0.71+0.89+2.13+39)×0.35
    0.677×((41.84+6.5)×350^4)/(100×206000×83333)
    1.0×(2.5+2+2)×1

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