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$$\frac{14}{19}\times\frac{57}{70}\times\frac{20}{21}=?$$
$$\frac{14}{19}\times\frac{57}{70}\times\frac{20}{21}$$
$$\frac{2}{1}\times\frac{1}{7}\times\frac{2}{1}$$
$$\frac{4}{7}$$
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