3sqrt2
    1998/（1998*1998/1999）+1/2000
    27×2+17+4
    27×2+17
    4/9+1÷4/9
    （2/3）^2
    19×269
    ［725×（1+0.0713）×1×1+150］×0.9915
    ［1-1/（1+8.0%）^56.42］/［1-1/（1+8.0%）^70］
    100/25
    1/2=
    log(2, 20)
    log(2,20)
    log(2, 1000000)
    133.8+151.2+193.4+225.8
    cos(-10.995574)
    8^2/3
    -1^0.3
    √82
    719-126

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