(2*1.3/0.3*461.89*673*0.68)^0.5
    (2*1.3/(1.3-1)*461.89*673*(1-0.75^(1.3/0.3)))^0.5
    (2*1.3/(1.3-1)*461.89*673*(1-0.625^(1.3/0.3)))^0.5
    (2/2.3)^(1.3/0.3)
     -25*3/2*3/2
    5 /2/3 * 3/2/ ( 1/5 )
    3999.38*(934000-2*10^6*0.0025)-4299.38*(930750-2*10^6*0.002326)
    5乘8/15
    6乘7/20
    5/6乘36
    0.556:80
     5/9 :80
    2.5:1.25
    2/9+(1-2/3-1/4)
    2/9÷3
    2/9/3
    ( 1/15+2/17 )* 1 5* 1 7
    4 * 0 . 0 8 * 2 . 5* 1 2 . 5
    (530*cos53.42)/cos33.42
    cos53.42

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