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
    (X-400)*0.75-30/1025=(X-460)*0.75/1000
    （(EBIT-400)*0.75-30）/1025=(EBIT-406)*0.75/1000
    (X-400)*0.75-30/1025=(X-406)*0.75/1000
    t^2=12t-36
    0.292=(((0+29258.32+x)/(0+265000))*(-665000)+20676.84+X+61944.65)/(-112398)
    (x+0.15)x = 0.0227(0.05-x)
    0.8＝-lgx
    0.292=(0+20676.84+x+((0+20676.84+x)/(0+265000)*(-665000))+61944.65)/(0+265000+(-665000)+287602)
    0.292=(0+20676.84+x+((0+20676.84+x)/(0+265000)*(-665000)))/(0+265000+(-665000)+287602)
    0.292=(0+20676.84+x+(0+20676.84+x)/(0+265000)*(-665000))/(0+265000-665000+287602)

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