3.1/2×(75.003+115.240)
    3.392×10.1×(2.964-0.4)+10×(2.964-0.4)
    0.295×(18.7×3.9+19×5.3+9.4×1.4+10.1×3.1+20)+10×4.5
    0.295×(18.7×3.9+19×5.3+9.4×1.4+20)+10×1.4
    10^-0.2578
    3.392×2.7×10.1+10×2.7
    6259.36×5.94+225.36×26.5+363.83×21.5+35.15×16.60-1.25（13.92×27.43+125.22×25.41+517.47×20.39+186.84×16.98+4031.56×7.00）=
    3.72十49十6.28十59
    411一13十711一23
    15十113十(0.8十413)
    90+arctan(9.44*0.4643)+arctan(9.44*0.2033)-arctan(9.44*0.2)-arctan(9.44*0.5)-arctan(9.44*0.0464)-arctan(9.44*0.0551)
    10^（1/0.0592）
    90+arctan(6.81*0.4643)-arctan(6.81*0.2)-arctan(6.81*0.5)-arctan(6.81*0.0464)
    (57800-0.3×38500)/(0.9×0.598×300)
    38600/(0.8×0.76×300)
    78900/(0.9×0.598×300)+38600/(0.8×0.76×300)
    √((19.28/1.22)^2+〖32.65〗^2 )
    (82.3×1000)/(7×360)
    (48.6×1000)/(7×360)
    √((12.39/1.22)^2+〖12.29〗^2 )

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