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800毫升8升 270÷6÷5270÷(6×5)
42÷3840÷60 (70-14)×470-14×4
×16= 12÷ = × = 0× + = 1÷ - ÷1=
÷ = 48×( - )= × ÷ × = ×2.4= 0.25÷ =
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