8854.81*10^6=22.4*2250x（1850-x/2）
    1/x = 2.035*lg(644684.44*x)-0.91
    1/x = 2.035*lg(320600*x)-0.91
    1/x = 2.035*lg(222600*x)-0.91
    1/x = 2.035lg(222600*x)-0.91
    1/x=2.035lg(644684.44*x)-0.91
    arctanx=0.92
    arctanx=0.92
    0.025+1.3*(x-0.025)=0.22
    elnx+x=0
    150=400-2.5x
    10x+4x^2=50
    x^27=27^x
    X-1/x
    x-e/x
    1-e/x
    (39/40)^2*(100-x)^2=x^2*(100-2*x)^2+25*x^2/((100-2*x)^2-x^2)
    a*a-3=2*a
    arccoc0.958
    （(X-400)*0.75-30）/1025=(X-460)*0.75/1000

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