0.2496x=39421
    —4a+2a×a=8080
    n^2+n=2^（n+1）
    0.7*x*2=3.85
    11x-2=14x-9
    x+（x*0.8*0.3/2*3.85%）+(x*0.8*0.4/2+(x*0.8*0.3+x*0.8/2*0.3*3.85%))*3.85%+((x*0.8*0.3/2+(x*0.8*0.4+((x*0.8*0.4/2+(x*0.8*0.3+x*0.8/2*0.3*3.85%))*3.85%))+(x*0.8*0.3+x*0.8/2*0.3*3.85%)))*3.85% = 239916.15
    x+（x*0.8*0.3/2*3.85%）+(x*0.8*0.4/2+(100*0.8*0.3+x*0.8/2*0.3*3.85%))*3.85%+((x*0.8*0.3/2+(x*0.8*0.4+((x*0.8*0.4/2+(x*0.8*0.3+x*0.8/2*0.3*3.85%))*3.85%))+(100*0.8*0.3+x*0.8/2*0.3*3.85%)))*3.85% = 239916.15
    x+（x*0.8*0.3/2*3.85%）+(x*0.8*0.4/2+(100*0.8*0.3+x*0.8/2*0.3*3.85%))*3.85%+((x*0.8*0.3/2+(x*0.8*0.4+((x*0.8*0.4/2+(x*0.8*0.3+x*0.8/2*0.3*3.85%))*3.85%))+(100*0.8*0.3+x*0.8/2*0.3*3.85%)))*3.85% = 104.71
    x+（x*0.8*0.3/2*3.85%）+(x*0.8*0.4/2+(100*0.8*0.3+x*0.8/2*0.3*3.85%))*3.85%+(((x*0.8*0.3/2+(x*0.8*0.4+((x*0.8*0.4/2+(x*0.8*0.3+x*0.8/2*0.3*3.85%))*3.85%))+(100*0.8*0.3+x*0.8/2*0.3*3.85%))))*3.85% = 239916.15
     x+（x*0.8*0.3/2*3.85%）+(x*0.8*0.4/2+(100*0.8*0.3+x*0.8/2*0.3*3.85%))*3.85%+((x*0.8*0.3/2+(x*0.8*0.4+((x*0.8*0.4/2+(x*0.8*0.3+x*0.8/2*0.3*3.85%))*3.85%))+(100*0.8*0.3+x*0.8/2*0.3*3.85%)))*3.85% = 239916.15
    x+（x*0.8*0.3/2*3.85%）+(x*0.8*0.4/2+(100*0.8*0.3+x*0.8/2*0.3*3.85%))*3.85%+(x*0.8*0.3/2+(x*0.8*0.4+((x*0.8*0.4/2+(x*0.8*0.3+x*0.8/2*0.3*3.85%))*3.85%))+(100*0.8*0.3+x*0.8/2*0.3*3.85%))*3.85%=239916.15
    124+x=0.9*(143+x)
    x+（x*0.8*0.3/2*3.85%）+（x*0.8*0.4/2+（x*0.8*0.3+x*0.8*0.3/2*3.85%）*3.85%+（x*0.8*0.3/2+（x*0.7+（x*0.8*0.4/2+（x*0.8*0.3+x*0.8*0.3/2*3.85%）+（x*0.8*0.3/2*3.85%））*3.85%=239916.15
    x+（x*0.8*0.3/2*3.85%）+（x*0.8*0.4/2+（x*0.8*0.3/2*3.85%））*3.85%+（x*0.8*0.3/2+（x*0.8*0.4/2+（x*0.8*0.3/2*3.85%）））*3.85% = 239916.15
    x*1.09+（x*0.8*0.3/2*3.85%）+（x*0.8*0.4/2+（x*0.8*0.3/2*3.85%））*3.85%+（x*0.8*0.3/2+（x*0.8*0.4/2+（x*0.8*0.3/2*3.85%）））*3.85%=239916.15
    1.0164=-1/x*ln(1-x)
    1.04=-1/x*ln(1-x)
    1.042=-1/x*ln(1-x)
    1.048=-1/x*ln(1-x)
    complex number calculation

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