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
    20-20*lg2-10*lg2
    20-20lg2-20lg(sqrt(2))
    855/57 996/83
    465/40 796/25 327/45
    6^2+5^2
    8^2+5^2
    (0-9/2-1/3)/(1/8-1/6)
    0-9/2-1/3
    [-(9/2)-(1/3)]/[(1/8)-(1/6)]+(5/4)*(2/5)*2
    （1/2)*[(1/3)+(1/2)]+[(5/6)-(1/4)]+3*[(5/6)+(2/7)]
    sin30.01
    -2e2+4e
    1/4+1/(4)^0.5+1/(5)^0.5
    1/4+1/(3)^0.5+1/(5)^0.5

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