577.02/(0.2*0.2)
    5.4*1000*10^2
    (0.2*0.2)/(2*0.005*(0.2+0.2) )
    (0.15*0.2)/(2*0.005*(0.15+0.2) )
    413.10+0.4*191.95+0.4*45.22
    413.10+0.7*191.95+0.4*45.22
    1×1.33×1.15×155.34/(2*10^5 )×((28+12)/(0.30+1.4×0.01))
    290.89+383.17
    (0.45*10^(-3))*1*1*1.1*180*1234*[(2+0.6*0.47)*30^0.5*0.224%*250]^0.5
    509/(2×35×1000)
    11.35000/(0.87*509*165)
    11.35/(0.87*509*165)
    0.6*377.52/255.98
    377.52/（255.98*1.234）
    877.507*（1-4*5850^2/15500^2）
    67.08+(317.33-67.08)*(2*5850/15500)
    330×509×(165-12/2)
    509/(1000×165)
     tan-1（0.33/0.2856）
    0.6*141.02/296.3

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