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    ln3^0.98=ln(3-x)
    0.98*ln300+0.02*ln200=ln(300-x)
    e^x+x^2/4=0
    x/((1-x^2)^(1/2))=0.30856723
    2129.55*1000000=13.8*1700*x(1350-x/2)
    2129.55*1000000=13.8*1700*x(1350-x/2)
    -2x^3-2x^2+4x-1
    -2x^3-2x^2+4x-1=0
    23.1^x=-1
    X^2+10x=58
    50/X=5/20
    100*(1+x)^3=133.1
    C(79,9)=
    C(79,9)
    C(79,9)
    C(79,9)
    70%-15%+((1+X)/X)*8%*(1-37.5%)=0
    x*x-96.8*x-56.1*56.1=0
    x*x-97.6*x-37.55*37.55=0
    14×x×x-15x+3=0

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