（0.4/78.11）/（0.4/78.11+0.6/92.13）
    （0.4/78.11）/0.4/78.11+0.6/92.13
    0.4/78.11
    √393555951
    lg1.097=
    ln3=
    lg1.007427=
    30344668615.14-26308937428.79
    5878288762.64-5305541098.92
    780743893.31-761621258.44
    2.736/0.632
    806766396.66-780743893.31
    86766396.66-780743893.31
    180-90-arctan(0.623)-arctan(0.2*0.623)-arctan(102.89*0.623)+arctan(16.05*0.623)
    1/0.1/0.623/0.156
    180-90-arctan(2)-arctan(0.2*2)
    2965550178.74-2706217465.90
    -90-arctan3.76-arctan0.376-arctan1.88
    sqrt35
    20-20lg2-10lg2

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