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=
    21×0.68×0.52=
    35.6×0.75×0.52=
    35.6×0.7×0.52=
    35.6×0.66×0.52=
    35.6×0.68×0.52=
    21×0.68×0.52=
    13.5×0.68×0.52=

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