0.000934x^2-0.01961x+0.017406=0
    0.93496=(0.0101x^2+0.0017639x-0.0040837)(ln(491/167120))^3+(0.14386x^2+0.018153x-0.088198)(ln(491/167120))^2+(0.59505x^2+0.03407x-0.65417)(ln(491/167120))+0.5818x^2-0.08846x-0.6729
    160x+(190－160)(x+0.15)=90
    160x+(190－160)(x+0.15)=90
    0.93496=(0.0101x^2+0.0017639x-0.0040837)(ln(491/167120))^3+(0.14386x^2+0.018153x-0.088198)(ln(491/167120))^2+(0.59505x^2+0.03407x-0.65417)(ln(491/167120))+0.5818x^2-0.08846x-0.6729
     100（1-x）² = 81
    2x*x+25x-450=0
     100-（1-x）² = 81
    100-（1-x）² = 81
    100-（1-x）²=81
    arctanx+arctan0.5x = 44
    arctanx+arctan0.5x=44
    64X^(4)-160X^(2)+144X+12=0
    x+12=x2
    1725x^2-1587000x+115000=0
    x^3-5x^2+3x+5=0
    0.0259*x*ln（x/（1.5*10^10））=2.36*10^14
    x/x-3=10
    X^3-30X^2-300X+9000=0
    0.1x=sin(x)

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