x^2=x+3
    25*x*x-32*x+7=0
    8.99x^3+111.7x^2-2450.67=0
    8.99x^3+111.7x^2-2473.8=0
    10.34x^3+82.67x^2-682.98=0
    66=65x+xx
    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

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