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    1.65=(667-408037.19/x^3)/sqrt(25.3^2+1512321647.9/x^6)
    1.65=(667-408037.19/x^3)/sqrt(25.3^2+1512321647.9/x^6)
    -2x^4-17x^3+17x^2-9x+3
    336.94*13%/360*X*1.5=91.67
    3.09=(667-408037.19/x^3)/sqrt(25.3^2+1202381101.42/x^6)
    1.65=(667-408037.19/x^3)/sqrt(25.3^2+1202381101.42/x^6)
    (3m-6)/(1+m)=2
    tanx-x=3
    3m-6/1+m=2
    3x-6÷1+x=2
    -10lg(1-x)=0.5
    sin(2π-a)×cos(3π+a)×tan(2π+a)/cos(2π+a)
    sina+cosa=
    x²+x-2=0
    x²+2=0
    x=-2lg(3.32×10^-5+7.02×10^-8x)
    x=-2lg(2.95×10^-5+7.90×10^-8x)
    x=-2lg(2.66×10^-5+8.78×10^-8x)
    x=-2lg(2.66×10^-5+1.2302×10^-7x)
    x=-2lg(2.95×10^-5+1.106×10^-7x)

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