-1.83-(-1.061+1.190)/3
    -6.719-（-7.166+7.347）/6.6
    0.55*2.718281828459^(-1)
    7.104-(-8.170+7.952)/6.9=
    1.83-(-1.061+1.190)/3
    6.719-（-7.166+7.347）/6.6
    -1.83-(-1.061+1.190)=
    -6.719-（-7.166+7.347）
    7.104-(-8.170+7.952)=
    1.83-(-1.061+1.190)=
    90-arctan(0.12*13)-arctan(0.02*13)-arctan(0.04*13)-arctan(5.1*13)+arctan(0.77*13)+arctan(0.1476*13)
    6.719-（-7.166+7.347）
    1/13/(3.69^0.5)
    (3.69^0.50)*70/0.12/13/13
    (1+sin35)/(1-sin35)
    90-arctan(0.12*13)-arctan(0.02*13)
    90-arctan(0.12*12.52)-arctan(0.02*12.52)-arctan(0.0509*12.52)-arctan(4.664*12.52)+arctan(0.8*12.52)+arctan(0.1252*12.52)
    90-arctan(0.12*12.52)-arctan(0.02*12.52)-arctan(0.0509*12.52)-arctan(5.83*12.52)+arctan(1*12.52)+arctan(0.1252*12.52)
    0.125×6.336×6.9^2-(21.295+23.949)/2=
    0.125×4.69×3^2-(4.465+4.822)/2=

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