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
    4=（2*（1+0.31x^2/2)/2.31)^(2.31/0.62)/x
    4×（6+5+h）＝96
    x*x+10580*x-13380*800=0
    15706=[（220+220）*42-x]*0.9+8*42
    x^x=49
    146.03(1+x)^5+130.54(1+x)^4+498.89(1+x)^3+539.46(1+x)^2+752.3(1+x)+1015.06-463.977(1+x)^5.75=0

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