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    20*lg{10/[4.4*[(1+4.4^2)]^0.5]}
    20*lg{15/7.5*[(1+7.5^2)]^0.5}
    20*lg{10/4.4*[(1+4.4^2)]^0.5}
    20*lg{1/4.4*[(1+4.4^2)]^0.5}
    1/4.4*[(1+4.4^2)]^0.5
    arctan0.33333=
    arctan1/3=
    180(15+60)(0.65)
    200(40十15)(0.65)
    200(40)(0.65)
    200(40+15)(0.65)
    5*6+8
    arctan(0.33×5.93)-arctan(0.5×5.93)-arctan(0.1×5.93)-arctan(0.033×5.93)
    -16.5×2
    arctan(0.5×2.52)+arctan(0.1×2.52)
    (5-3.2)×150+(3.6-2.4)×300
    e^(-2)
    e^(-1)
    90+arctan(0.25*9.84)—arctan(0.5*9.84)—arctan(0.04*9.84)
    90+arctan(0.25*9.72)—arctan(0.5*9.72)—arctan(0.04*9.72)

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