4.41%*30/89+16.22%*4/89+9.65%*55/89=
    5.5*20+2.75*40=
    4e
    e3*e(-3)
    e3*e(1/3)
    4*(2^((-1)/3)+1)*((2^((-1)/3))^2-2^((-1)/3)+1)
    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）

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