arctan(5/-22.082940)
    arctan(5/22)
    1/2-（1/4+1/25）
    C(30,2)
    C(30,15)
    100-20*log(10,314)-20*log(10,sqrt(1+314*314))+20*log(10,sqrt(1+314*314/4))-40*log(10,sqrt(1+314*314/625))
    100-20*log(10,12.79)-20*log(10,sqrt(1+12.79*12.79))+20*log(10,sqrt(1+12.79*12.79/4))-40*log(10,sqrt(1+12.79*12.79/625))
    -90-2*arctan(12.79/25)-arctan(12.79)+arctan(12.79/2)
    -90-2*arctan(314.320444/25)-arctan(314.320444)+arctan(314.320444/2)
    90-2*arctan(314.320444/25)-arctan(314.320444)+arctan(314.320444/2)
    -90+2*arctan(12.794192/25)
    -90-2*arctan(314.320/25)
    -90-2*arctan(87.172/25)
    e1e2e1*abs610
    e1e2e1--abs610
    e1e2e1-abs610
    e1e2e1+abs610
    e3e2e3+abs870
    e3e2e3-abs870
    4023—75

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