（50-x/10）*（160+x）=9450
    1/((X-1)*X)=0.00162
    1/((X-1)*X)=0.000494
    83000+5000*8.3
    83000*(1+0.05)^8.3
    (415-X)/(415*(X-1)*X)=0.000464
    83000*（1+0.05）^x=83000+5000*x
    -x^3+5x^2-10x-4=0
    -x*3+5x*2-10x-4=0
    59270000*ln(16*x)/x=14840
    59270000*ln(10*x)/x=14840
    59270000*ln(433*x)/x=14840
    59270000*ln(822*x)/x=14840
    x^(x^3)=36
    0.523＝12.825x－0.0396
    0.437＝12.825x－0.0396
    0.36＝12.825x－0.0396
    0.233＝12.825x－0.0396
    0.177＝12.825x－0.0396
    59270000*ln(0.024663677*x)/x=14840

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