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纠错
$$\frac{1}{r}$$ of a circular pizza has been eaten. If the rest of the pizza is divided into m equal slices, then each of these slices is what fraction of the whole pizza?
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A$$\frac{r}{rm}$$
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B$$\frac{r-1}{rm}$$
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C$$\frac{1}{m}$$
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D$$\frac{m-1}{rm}$$
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E$$\frac{m-r}{rm}$$
B显示答案