12×0.6×0.6=
    20.80×0.64×0.6=
    53.60×0.64×0.6=
    33.61×0.59×0.6=
    33.62×0.59×0.6=
    33.63×0.59×0.6=
    33.64×0.59×0.6=
    33.65×0.59×0.6=
    33.8×0.59×0.6=
    33.6×0.59×0.6=
    2/0.9
    （1+1/2）（1+1/2）（1+1/2）=
    (π/4)-arctan(1/e)
    (π/4)-arctan(e^(-1))
    (π/4)-arctan(1/e)
    12.5×0.42×0.6=
    -arctan(1/e)+(π/4)
    -arctan(1/e)+π/4
    -arctane^1+π/4
    -arctan1/e+π/4

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