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)
    X/112-4.5/45-13/44.7-60/500-15/1650=0.0027(92.5+X)
    1/5X + 2/5X + 3/5X + 4/5X + 5/5X = 1
    1/26a+2/26a+3/26a+4/26a+5/26a+6/26a+7/26a+8/26a+9/26a+10/26a+11/26a+12/26a+13/26a+14/26a+15/26a+16/26a+17/26a+18/26a+19/26a+20/26a+21/26a+22/26a+23/26a+24/26a+25/26a+26/26a=1

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