20x^3-7x^2-9x=13
    X×0.49=67
    2t^3+t^2-4t
    0.5^2+0.3^2
    0.5^2+0.3^
    0.508^2+0.304^2
    ((1+x)/(1-x))^2
    √3
    Sqrt3
    Sqr(3)
    log(2,1/3)
    log(1/3,1/2)
    (12.2×1.645+14×4.005)/5.65
    (8^0×1.645+9^0×4.005)/5.65
    (8×1.645+7.1×4.005)/5.65
    √{[(9+9√3)/2]^(2)+81/4}
    [(9+9√3)/2]^(2)+81/4
    0.5×18+0.5×8+1.5×7+3.7×9+1.350×8
    x-81502.4=49.39%*x
    0.85X*40+0.15X*15=15235*0.53

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