-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
    20（1+x）^2+400(1+x)=440
    32.49=(17.57+45.21+8.5562x)*x/2
    400x^2+399x-1=0
    400x^2+399x-1=0
    400x^2+399x-1=0
    400x^2+399x-1=0
    400x^2+399x-1=0
    400x^2+399x-1=0
    400x^2+399x-1=0

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