x^2-2x+3
    x*99.975%-113.091*100.025%=1/10
    x=151881.6*(0.83*(1-0.83^5))/(1-0.83)-414748.41
    0=x*(0.83*(1-0.83^5))/(1-0.83)-414748.41
    0=x*(0.83*(1-0.83^5))/(1-0.83)-414748.41
    0=x*(0.83*(1-0.83^5))/(1-0.83)-414748.41
    0=x*(0.83*(1-0.83^5))/(1-0.83)-417148.41
    x=151881.6*(0.83*(1-0.83^5))/(1-0.83)-417148.41
    x=(0.83(1-0.83^5))/1.67*151881.6-414748.41
    1/d+1/(d+5)+1/(d+2)=0
    414748.41=151881.6*(q*(1-q^5))/(1-q)
    d*d-8*d-52=0
    5/131-35/2000-40/1650+X/126+8/87=0.00243(88+X)
    1/d+1/(d+2)=1/(1-d)
    12.1c=（3.4+c）×7.93
    12.1c=（3.3+c）×7.93
    13-2x=x+1
    (x+(3+3^(1/2))/2)(x+(3-3^(1/2))/2)
    30x×1/6
    6x+5x-(6x-1/6)=180

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