Mathematics
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    52×0.7×0.55+3=
    42×0.7×0.55+3=
    52×0.7×0.55+3=
    52×0.7×0.5+3=
    52×0.7×0.5+3=
    52×0.68×0.55+3=
    52×0.68×0.5+3=
    17.9×0.68×0.5+3=
    342/8
    26547890×555235596
    331/4
    41*31
    1+1
    80--18+1
    38.2×0.68×0.5=
    21.6×0.68×0.5=
    21.6×0.66×0.5=
    15.9×0.66×0.5=
    15×0.66×0.5=
    35×0.66×0.5=

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