20lg(16/x^2)=36
    2*sqrt(1+(0.05x)^2)/(x*sqrt(1+(0.01x)^2))=1
    100*sqrt(1+x^2)/(x*sqrt(1+(0.1x)^2)*sqrt(1+(0.01x)^2))=1
    x(x+5)=24
    x^2-12.9x+38.5=0
    7/60=5/24w+11/12
    3/2x-2/3x=2
    1/4x+3/4x=7
    1/4x+3/4
    （x+5）x17-27=500
    1000*1.2＾x＝10000
    0.7854*X^2=64.41
    6.11=（（0.021*x^1.85+955）^0.5）*x^0.84
    733.2=（（0.021*x^1.85+955）^0.5）*x^0.84
    （78.5-Y）/Y=0.2
    （78.5-Y）/Y=0.16
    （78.5-Y）/Y=0.21
    （30-Y）/Y=5
    （26.448+x）×2.55＝52.895+72.643-x
    （26.448+x）×2.35＝52.895+72.643-x

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