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=
    25×0.66×0.5=
    35×0.66×0.5=
    25×0.66×0.5=
    15.8×0.66×0.5=
    29.8×0.66×0.5=
    52.8×0.66×0.5=
    15.8×0.66×0.5=
    35.8×0.68×0.5=
    35.8×0.67×0.5=
    35.8×0.66×0.5=
    sin3/23

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