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OpenStudy (anonymous):
3/7 divide 1/21=
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mathslover (mathslover):
\(\cfrac{\cfrac{3}{7}}{\cfrac{1}{21}}\) Which I can write as : \({\cfrac{3}{7}} \times \cfrac{21}{1}\) (This is a rule, the denominator will get reversed (reciprocal) and we will multiply it to the numerator)
mathslover (mathslover):
Or : \(\cfrac{\cfrac{a}{b}}{\cfrac{c}{d}} = \cfrac{a}{b} \times \cfrac{d}{c}\)
mathslover (mathslover):
Are you getting my point @baby258
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