a) \(\frac{{57}}{{10}}\,\)

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Viết (theo mẫu)

Mẫu: \[\frac{{41}}{{10}}\,\, = \,\,\frac{{40\,\, + \,\,1}}{{10}}\,\, = \,\,\frac{{40}}{{10}}\,\, + \,\,\frac{1}{{10}}\,\, = \,\,4\,\, + \,\,\frac{1}{{10}}\,\, = \,\,4\frac{1}{{10}}\]

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b) \(\frac{{705}}{{100}}\,\)

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c) \(\frac{{3\,\,005}}{{1\,\,000}}\,\)

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Giải thích

a) \(\frac{{57}}{{10}}\,\, = \,\,\frac{{50\,\, + \,\,7}}{{10}}\,\, = \,\,\frac{{50}}{{10}}\,\, + \,\,\frac{7}{{10}}\,\, = \,\,5\,\, + \,\,\frac{7}{{10}}\,\, = \,\,5\frac{7}{{10}}\)

b) \(\frac{{705}}{{100}}\,\, = \,\,\frac{{700\,\, + \,\,5}}{{100}}\,\, = \,\,\frac{{700}}{{100}}\,\, + \,\,\frac{5}{{100}}\,\, = \,\,7\,\, + \,\,\frac{1}{{20}}\,\, = \,\,7\frac{1}{{20}}\)

c) \[\frac{{3{\rm{ }}005}}{{1{\rm{ }}000}}\,\, = \,\,\frac{{3{\rm{ }}000\,\, + \,\,5}}{{1{\rm{ }}000}}\,\, = \,\,\frac{{3{\rm{ }}000}}{{1{\rm{ }}000}}\,\, + \,\,\frac{5}{{1{\rm{ }}000}}\,\, = \,\,3\,\, + \,\,\frac{1}{{200}}\,\, = \,\,3\frac{1}{{200}}\]