log(2,0.6)
    log(2,0.4)
    (1/3)^-0.1
    （1/3）^0.1
    2^-0.1
    2^0.1
    ln2=
    (2/3.8)-(0.8*2/3)
    0.2/1.5
    1.8/1.5
    2/3.8
    (3-sqrt(21))/2
    505.2891+825.1914
    (50001*2001/70002)/(3^0.5)
    (20001*2501/70002)/(2^0.5)
    (20001*2501/70002)
    50001*2001/70002
    20001*2501/70002
    2/28
    2/28

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