cos(x)=(cos(0.5)-1)/(1-0.1cos(0.5))
    tanx=5/π
    x-0.1sin(x)=0.4523165
    x3-15X-4=0
    d^3+4*d^2+5*d+3=0
    x*1.3=3.76
    x*1.3=3.6
    xx+21x+99=0
    x*x=1771
    x/lnx=(64/ln64)^2
    x=64/ln64
    x/(3*x/4+3)=-√3
    84.1 = 35.137ln(x) - 3.5731
    50 = 35.137ln(x) - 3.5731
    25/256*x^3+x-2=0
    lgt＝4.16
    n^2-n-306=0
    12000=1500*(1-(1+16%/12)^(-12n))
    -0.2136x^2+3.0432x-10.1458=0
    145000000=13.8×200×X×（460-X/2）

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