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
    38.24/(2*2)+28.47
    53.27-3.7*(356.4/27)
    9/56+2/7+3/8
    (1.22*287*206.88)^0.5
    (1.22*287*150.26)^0.5
    (450^2-150^2)/(2*(206.88-150.26))
    206.88/150.26
    285000/(4.8*287)
    69000/(287*1.6)
    2/3-8/(9*π)

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