-arctan1/6
    -arctan1/6
    -arctan1/6
    (-4/3)*(104/25)+8/3
    (3/4)*(104/25)-6
    sin4.71
    sin0.5
    2-(-4)+6/(-2)+(-3)*2
    -2^2*1/2+8/(-2)^2
    lg0.03
    lg0.0000175
    lg0.00000000056
    lg5.6
    lg0.00000648
    √0.42
    √5.6×0.075
    5.04*100000/0.3/(4*10000000)
    log（10，0.0001085）
    60/40000
    1+45.08%

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