x^2+1=2^x
    x^2-2x=0
    56a*a*a*a－104a*a*a+129a*a－80a＝40
    Kjk
    10y-y*y=40
    36x^2+x-580=0
    18-3X =3
    （X-8%）/1%=(5-4.6610)/(5.6044-4.6610)
    （X-8%）/(9%-8%)=(5-4.6610)/(5.6044-4.6610)
    3.2x-2=10+2.4x
    99-x/2=4
    0.5（X+1.2)+1.5X=1
    x²+8x+14=0
    x+36/x
    6*x^3+7*x^2-9=0
    2*x=1
    1/(1/30+2x/0.1+x/0.06+1/12)=0.7
    x^3-2*x^2+1=0
    x^2-1=x^3-x^2
    2*x*(1-x*x)^0.5=0.91

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