1-1/(1+(h/95/2)^2)^(3/2) = 0.161/0.947
    73.19/x=40.7+x/2*(62.78+8.56x)
    73.19=40.7+x/2*(62.78+8.56x)
    6/7 x:25=x-560:21
    4s^3+15s^2+16s+6=0
    x*(4.9-28.9x)+81.4=0
    0.62x-0.09868sin（πx）+0.2418x-0.10075= 0.2122(sin（πx）^3)+0.0372sin（πx）+0.0372sin（π（1.25-2x））
    x*(4.9-28.9x)=64.98
    25z+12z=750z
    -20log(10,188.2/x)=-38
    -20log(10,188.2/x)=50
    （25Z+12Z）/Z=150
    3x+5×2=31
    3x+5X×2=31
    24+3x=27
    x+20×2
    38.41=(17.57+45.21+8.5562x)*x/2
    38.41=(17.57+45.21+8.5562x)*x/2
    38.41=(17.57+45.21+8.5562x)*x/2
    38.41=(17.57+45.21+8.5562x)*x/2

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