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
    2700➗600
    600➗2700
    10*10
    （20+3）×(80+6)
    65.8×0.75×0.52=
    65.8×0.74×0.52=
    35.6×0.68×0.52
    65.8×0.73×0.52=
    49.9×0.73×0.52=
    49.9×0.68×0.52=

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