509.83/( 20.671)
    509.83/79.537
    83.3/100*60+580/750*40
    83.3/100*60+550/750*40
    0.101969/0.882971681437634
    1.054153^12
    0.054153*1.054153^12
    arccos0.5
    ((8*1.414*4*0.2*0.65*150)/(2*3775/60*2*3.14*6.5*0.001))^(1/2)
    ((8*1.414*4*1*0.65*150)/(2*3775/60*2*3.14*6.5*0.001))^(1/2)
    ((8*1.414*4*5*0.65*150)/(2*3775/60*2*3.14*6.5*0.001))^(1/2)
    ((8*1.414*4*0.02*0.65*150)/(2*3775/60*2*3.14*6.5*0.001))^(1/2)
    (125.52×10^3)/(39.55×10^2 )+(5.95×10^6)/(1.05×250.2×10^3 )+(0.15×10^6)/(1.2×33.137×10^3 )
    (154.31×10^3×880.21×10^3)/(33759×10^4×13.5)
    (64.54×10^3×144.98×10^3)/(2502×10^4×9)
    0.047581/513.3988
    1.07 - 0.282/0.7405
    1.07 - 0.282/0.709
    (27.71×10^3)/(111.4×10^2 )+(52.33×10^6)/(1.05×1500.4×10^3 )
    (52.33×10^6)/(1.05×1500.4×10^3 )

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