3+8677
    3+8
    -arctan0.1×0.1-arctan0.01×0.1-arctan(1/0.375)×0.1-arctan(1/84.85)×0.1+arctan(1/3)0.1+arctan(1/10.61)×0.1 =
    （48.9735-48.9671）/（50*0.0011996824）
    9.58*（14.8+4.46+13.4+16.14+16.96）+（14.8+16.14）*16.96+16.9*2-3.14*3.14*3.14
    90-atan（0.2×0.12）atan（0.02×0.2）
    0¼/0¾
    6.3*1.5+1.33*0.75
    6.3*1.5+1 1/3*0.75
    -90-arctan0.12×7.073-arctan0.02×7.073-arctan(1/0.205)7.073-arctan(1/23.894)7.073＋arctan(1/1.3)7.073＋arctan(1/7.073)7.073=
    -90-arctan0.12×300-arctan0.02×300-arctan(1/0.205)300-arctan(1/23.894)300＋arctan(1/1.3)300＋arctan(1/7.073)300=
    -90-arctan0.1×300-arctan0.01×300-arctan(1/0.375)300-arctan(1/84.85)300＋arctan(1/3)300＋arctan(1/10.61)300=
    -90-arctan0.1×200-arctan0.01×200-arctan(1/0.375)200-arctan(1/84.85)200＋arctan(1/3)200＋arctan(1/10.61)200=
    -90-arctan0.1×100-arctan0.01×100-arctan(1/0.375)100-arctan(1/84.85)100＋arctan(1/3)100＋arctan(1/10.61)100=
    -90-arctan0.1×90-arctan0.01×90-arctan(1/0.375)90-arctan(1/84.85)90＋arctan(1/3)90＋arctan(1/10.61)90=
    -90-arctan0.1×84.85-arctan0.01×84.85-arctan(1/0.375)84.85-arctan(1/84.85)84.85＋arctan(1/3)84.85＋arctan(1/10.61)84.85=
    -90-arctan0.1×70-arctan0.01×70-arctan(1/0.375)70-arctan(1/84.85)70＋arctan(1/3)70＋arctan(1/10.61)70=
    -90-arctan0.1×60-arctan0.01×60-arctan(1/0.375)60-arctan(1/84.85)60＋arctan(1/3)60＋arctan(1/10.61)60=
    -90-arctan0.1×50-arctan0.01×50-arctan(1/0.375)50-arctan(1/84.85)50＋arctan(1/3)50＋arctan(1/10.61)50=
    -90-arctan0.1×40-arctan0.01×40-arctan(1/0.375)40-arctan(1/84.85)40＋arctan(1/3)40＋arctan(1/10.61)40=

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