(X-X/1.09*0.03)*0.02=49518.54
    (X-X/1.09*0.03)*0.02=212808.62
    (X-X/1.09*0.03)*0.02=129644.44
    x^2-14.8x+52.2=0
    200=x^2*sqrt(x^2+1)*sqrt(100x^2+1)
    X^5+10X^3+20X-4=0
    X^（5）+10X^（3）+20X-4=0
    a^2=-455
    x^3+x=6
    26700+X-X*2.5%=50000
    x*x*x+x*x-1＝0
    （26.274+x）×2.95＝52.549+71.123-x
    （26.274+x）×2.65＝52.549+71.123-x
    （26.274+x）×2.35＝52.549+71.123-x
    （26.274+x）×2.15＝52.549+71.123-x
    （26.274+x）×1.95＝52.549+71.123-x
    （26.274+x）×2.65＝52.549+70.623-x
    （26.274+x）×2.75＝52.549+70.623-x
    （26.274+x）×2.95＝52.549+70.623-x
    4=（2*（1+0.4x^2/2)/2.4)^(2.4/0.8)/x

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