500/4
    500/40
    453271=22837
    4326668/67823879
    23455/457
    243+4357
    x^3-3x^2-24x-1=0
    e∧(6301*10*12.36*x)=(x*6301+5999)/(5999+x*5999)
    e(6301*10*12.36*x)=(x*6301+5999)/(5999+x*5999)
    tan(x)=x
    arctan3.16
    arctan20
    0.63(w-0.07)=1
    0.63x=1
    （2.5x*(5.5+22.09/x)^-2）=1
    X(X+3)(X-3)=575
    s = 0.25 1.5*s^3 - 2.5*s^2 + 1 =
    0.1*（-20）^3-2*（-20）^2+15*（-20）+10
    -4-1
    -5÷5

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