64*11.56
    11.56*16
    64*3.2
    3.2*16
    0.018*0.988
    sqrt(0.018)/0.135738
    20lg7.541
    2.4*3.142
    4/sin65.38
    180-162
    -90-arctan(0.05*6.83)-arctan(0.2*6.83)
    -90-arctan0.05*6.83-arctan0.2*6.83
    0.02*1.035
    1/(6.83*sqrt(0.02))
    2.175*3.142
    0.02*1.035
    1/(6.83*sqrt(0.02))
    20lg6.83
    20lg20
    20lg5

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