Mathematics
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    (192*1.3-192)/0.4
    192*0.3/(4000*1.3)
    192*0.3
    0.3/(100*1.3/208)
    (320*1.3)/2
    2/(320*1.3)
    0.3/(100*1.3/832)
    320*1.3/0.5
    3/7÷7/11+4/7÷7/11
    (0.8/60)^(1/3)
    (0.8/60)^1/3
    sqrt(0.8/60)
    arctan(0.035*7.5)
    arctan(1*7.5)
    arctan(0.50*7.5)
    arctan(0.51*7.5)
    20lg80=
    1/[7.5*[14.32^0.5]]
    20*lg{15/[7.5*[(1+7.5^2)]^0.5]}
    20*lg{10/[7.5*[(1+7.5^2)]^0.5]}

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