lnx/x^2
    24x^2-20x+3=0
    （sinx+x^3）÷x^2
    a×0.6=30.9
    a×0.6=22.6
    a×0.6=13.6
    a×0.6=10.9
    a×0.6=9.9
    20.3×25.4÷x＝20.3×15.2÷120
    515.62×x＝2.57
    (2*1.414*x-x^2-1)^(-0.5)*(x/1.414-1)=x/1.414*(1-x^2)^(-0.5)
    (2*sqrt(2)*x-x^2-1)^(-0.5)*(x/sqrt(2)-1)=x/sqrt(2)*(1-x^2)^(-0.5)
    (2*sqrt(2)*x-x^2-1)=1
    x^6-13x^5+64*x^4-150*x^3+174*x^2-94*x+18=0
    10*x^4-152*x^3+840*x^2-2012*x+1780=0
    60x^3-684x^2+2520x-3012=0
    240x^2-1824x+3360=0
    600x-2280=0
    2*x^5-18*x^4+54*x^3-60*x^2+17*x=0
    (-2)*x^3+24*x^2-91*x+108=0

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