4-12
    4-(-12)
    -4/-2
    1960/2014*3058/4102*5567/(2014+4012)
    35-(-4)
    39-(-4)
    -1/1
    9^3 81^2
    17^2
    1^2
    3.973133981024493/3.14/e
    0.8^-0.5
    log(3,11)
    sin（π/12）
    sinπ/12
    2∧0.8
    350/sqrt(2)=
    log(9,11)
    3.5/sqrt(2)=
    1/sqrt(2)=

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