(((2*3.14*5.5)/x)^2)/5.5=(((2*3.14)/x)^2)*5.5
    10(10－x)－3x = 48
    5y^(2)－18y+69=0
    5y^(2)－18y+69
    0.0204=1.2*X/(1-0.2*X)
    2x^(2)-x=3
    1.2*X/(1-0.2*X)-0.43=-2*(X-0.01)
    1.2*X/(2.2*X+1)-0.43=-2*(X-0.01)
    5762.53/7560.64=（x-3）/（9-x）
    10451.97/3992.41=（x-3）/（9-x）
    19+1/x=0.8
    2x^3-7x^2+2x+2=0
    460000=1.83×（390x-120×390）+9.6×(390×120)
    -4x^2+17x-13 = 0
    4x^2+17x-13 = 0
    4x^2+17x-13.2=0
    4x*2+17x-13.2=0
    X^2+10x+100=0
    x^10-1=7.25806(x^11-x^10)
    sin613+cos1063

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