6.5=5x+2.5
    6.3=4.5x+2.3
    6.5=4.5x+2.3
    ln（0.4613/0.0109）=-30990/8.314*（1/x-1/298.15）
    x/［（1-0.5*x）^2*3^1.5］=5.98*10^-4
    x+33+95=157
    4.0746=（（30.56*0.847（x+0.1））/（1+0.847（x+0.1））*（（100-8.28-1.4）/100）*（1/(1+0.31*1.4）+（（2.26（x+0.1））/（1.3*0.101325））
    x^2+5sqrt(3)x-6=0
    (t^2-1)sint/2=0
    （3x+1)×(x+2)
    （3x+1)×(x+2）
    （√5+2）^x+（√5-2)^x =18
    x^2/（100-2*x）=31.2
    (X-X/1.09*0.03)*0.02=162053.71
    (X-X/1.09*0.03)*0.02=77737.69
    0.5*0.5*0.5*0.5x=64
    arctanx+arctan(x/2)=270
    sqrt(7)*2x=4
    x^2/（100-2*x）=31.32
    X-0.006X=189

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