666*666
    36+360+3600+360+3600+36000+3600+36000+360000
    36+360+3600+360+3600+36000+3600+36000+360000
    18×0.68×0.5=
    15×0.68×0.5=
    15.36×0.68×0.5=
    73.8×0.68×0.5=
    48.8×0.68×0.5=
    33.6×0.68×0.5=
    24.6×0.68×0.5=
    11.7×0.68×0.5=
    63.8×0.68×0.5=
    37.8×0.68×0.5=
    25.8×0.68×0.5=
    16.5×0.68×0.5=
    (4×4900/3×1000)/(3×3.14×100×100)
    123456×52869455245654
    tan0.5
    arcsin0.8
    arcsin4/5

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