(-0.5)+(3又1/4)+2.75+(-5又1/2) =

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(-0.5)+(3又1/4)+2.75+(-5又1/2) =

(-0.5)+(3又1/4)+2.75+(-5又1/2) =
(-0.5)+(3又1/4)+2.75+(-5又1/2) =

(-0.5)+(3又1/4)+2.75+(-5又1/2) =