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$$\frac{1}{r}$$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.$$\frac{r}{m}$$
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B.$$\frac{r-1}{m·r}$$
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C.$$\frac{1}{m}$$
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D.$$\frac{m-1}{m}$$
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E.$$\frac{m-r}{m}$$
B显示答案
