（10-x）(6-2x)=54
    194.9=0.1w×w+2.152w+20
    x²－0.3x－0.1
    195=0.1w×w+2.152w+20
    195=0.1w×w+20152w+20
    1.7x=e^2x-1
    2.3x=e^2x-1
    1.3x=e^2x-1
    2.7x=e^2x-1
    a^4-a^3-a^2+2*a+1=0
    1=2.72^[3000*(1/304-1/x)]+2.72^[4000*(1/320-1/x)]+2.72^[5000*(1/330-1/x)]
    1=2.71^10*((1/2.71)^(3000/x))+2.71^12*((1/2.71)^(4000/x))+2.71^13*((1/2.71)^(5000/x))
    1=e10*(1/e^(3000/x))
    1=e10*(1/e^(3000/x))+e12*(1/e^(4000/x))+e13*(1/e^(5000/x))
    1=e3+x
    1=e[3000/x]
    1=e[3000*(1/304-1/x)]
    1=e[3000*(1/304-1/x)]
    1=e[3000*(1/304-1/x)]+e[4000*(1/320-1/x)]+e[5000*(1/330-1/x)]
    1=e^[3000*(1/304-1/x)]+e^[4000*(1/320-1/x)]+e^[5000*(1/330-1/x)]

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