X+XlnX-lnX=0
    3x－2>X＋4
    0.004804x^2-0.8x+35.77=0
    0.17005849=x(3.68-x)
    3x=4
    2x^2-x-4=0
    2e^2x+lnx/x^2
    x：（5.4-x）=5：4
    (10x+1)-(100+x)=666
    1x^0.6=(2-x)^0.35
    18%x－35=20
    18%－35=20
    41x^2-10x+9=0
    0.8x-0.656(x)^(1/2)-1000>=0
    0.8x-0.66(x)^(1/2)-1000>=0
    0.8x-0.66(x)^(1/2)-1000=0
    3［x-2(x-2)］>-2+9
    （2-x）（5-x）（5-x）-40+24x=0
    565x+8100=9115
    565x+7200=9115

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