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×100= ÷ = 0.75× = ÷ = ×0÷ =
6÷ = ÷2= 75× = × = 时:80分钟=
×16= × = 9× = × =
÷2= 12÷ = ÷ = ÷ =
× × × ÷ ×
÷ ÷ ÷ ÷ ×
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