lnx-1／x
    !(x)=40320
    36x^16=6/x
    3x^3=26x^2
    3x=2
    123-3x=98^x
    123-3x=98^x
    ln(x^2)=x
    27x^2+172x-192=0
    x=lnx
    x^5=1.3^x
    x^5=1.0001^x
    x=(2sinx)/x
    1=x^2+x^3
    x^2=3
    x^6+6x^4+19x^2-24=0
    x^3+6x^2+19x-24=0
    xlnx=1+x
    x^3+2x^2+x+2＝0
    sqrt(2a/9.8）+a/340=6

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