x²-2x+4/13＝0
    2x^2-x-4＝0
    (x-4930)/(5440-4930)
    6.1*（1+x）^5=11
    -0.2x×x+x+2=3.05
    x=（（1.3*24846416）/（3.52*9604000））+4.1
    I=800/(√3×10)
    x×e^(-x)
    (cos60*x)+x^2=60
    (cos60*x)x^2=60
    cos60*x=60
    5x+5=1
    √x
    5814-x(x-1)(x-2)-(20-x)(19-x)(18-x)=2496
    4896-x(x-1)(x-2)-(19-x)(18-x)(17-x)=2496
    2745-x^3+3x^2-3x-(15-x)^3=2496
    1332-x^3+3x^2-3x-(12-x)^3=2496
    C(4,x)=6
    C(x,4)=6
    a*a+a=600

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