46.2×0.36×0.5-46.2×0.15+3=
    sin（1/4)
    sin1/4
    46.2×0.36+46.2×0.36×0.5-46.2×0.15+3=
    46.2×0.35+46.2×0.35×0.51-46.2×0.15+3=
    46.2×0.35+46.2×0.35×0.5-46.2×0.15+3=
    46.2×0.35+46.2×0.35×0.5-46.2×0.15+3=
    46.2×0.35+46.2×0.35×0.5=
    46.2×0.35+46.2×0.35×0.52=
    46.2×0.35+46.2×0.35×0.52=
    46.2×0.35+46.2×0.35×0.51=
    46.2×0.53=
    46.2×0.53-46.2×0.15+3 =
    15.6×0.5-（15.6×0.15）+3=
    15.6×0.6-（15.6×0.15）+3=
    15.6×0.6-（15.6×0.15）=
    15.6×0.6=
    15.6×0.5=
    15.36×0.5=
    15.36×0.35=

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