e^x/e-x=0
    e^x-e*x=0
    e^x-ex=0
    2^x-x=log(2，e)-log(2，log(2，e))+1
    2^x-x=log(2，e)-log(2，log(2，e))
    2^√√x=19683
    2^√√x=7625597484987
    65536^log(2，h)=7625597484987
    4274967296^log(2，h)=43046721
    134217728^log(2，h)=7625597484987
    512^log(2，h)=7625597484987
    8^log(2，h)=7625597484987
    8^log(2，h)=387420489
    8^log(2，h)=343
    arctanx+arctan0.1x+0.1x=π/2
    2 x+156-3x=120
    e^x-x+1÷(e^x-x)=2
    2^x-x+1÷(2^x-x)=2-(π-e)^2÷9*2
    2^abs(x)/abs(x)=e/log(2，e)
    √z+√(-z)=√2

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