x=22641.1625-0.331538*x
    (1.21550625+1.157625+1.1025+1.05+1)*0.06
    (0.28)/(0.2-x) =ln(1/(0.11-x)/(0.11-x)*(0.15-x)*(0.2-x))
    6000*1.21550625+5000*1.157625+4000*1.1025+3000*1.05+2000
    8x^3-23x^2+20x-5=0
    12x^2+40x-15=0
    5x-0.6x3=2.9
    x = (6000-0.06*x)*1.21550625+(5000-0.06*x)*1.157625+(4000-0.06*x)*1.1025+(3000-0.06*x)*(1.05)+(2000-0.06*x)
    1.05^2
    (0.28)/(0.2-x) =ln((0.11-x)*(0.11-x)/(0.15-x)/(0.2-x))
    1.05^3
    1.05^4
    x=(6000-0.06*x)*[(1.05)^4]+(5000-0.06*x)*[(1.05)^3]+(4000-0.06*x)*[(1.05)^2]+(3000-0.06*x)*(1.05)+(2000-0.06*x)
    18-2（3-4x)＝12
    x^2-18x+1=0
    4x^2+20x-35=0
    -(2-x)^(2)+1=1
    4*383.98-15*101.85
    80/[1-(1/1.08)^20]
    x^(2)+x-2048＝0

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