x²-1820x+577565=0
    1.59 = 7.71*10^-8*10*((x-0.52)^2.75/2.75+4486.88*(x-1))
    240Q=-2400
    1.59=7.71*10^-8*10*((x-0.52)^2.75/2.75-4486.88*(x-1))
    920Q-630Q-50Q-1520=880
    int(140/0.3)+1
    1/15+1/3+（1/15+1/12）x＝1
    4×（1/10+1/15）+1/15x＝1
    17/6（x+24）＝3（x－24）
    1.015/(7.71*10^-8*10)=(x-0.52)^2.75/2.75+4486.88(x-1)
    （x-0.52）^2.75-12338.92x= 3607959.394
    （x-0.52）^2.75-12338.92x = 2654905.841
    x²-1820x+616626=0
    （x-0.52）^2.75-12338.92＝2654905.841
    x²-1820x+61626=0
    x²-2x=0
    x+4+20+15%x+（x+15%x）*13%=2600
    0.9*0.79*2.49*x=4.25
    k/2+sqrt(1+k/4)=sqrt(k^2-1)+k
    a^3-3a+1=0

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