Tính bằng cách thuận tiện.

\(\frac{{15}}{{31}}\,\, + \,\,\frac{{31}}{{15}}\,\, + \,\,\frac{{16}}{{31}}\,\, - \,\,\frac{{16}}{{15}}\)

\(\frac{{23}}{{174}}\,\, \times \,\,\frac{{25}}{{283}}\,\, \times \,\,\frac{{174}}{{25}}\,\, \times \,\,\frac{{283}}{{23}}\)

a) \(\frac{9}{5}\,\, + \,\,\frac{1}{2}\) =

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c) \(\frac{8}{7}\,\, \times \,\,\frac{{21}}{4}\)

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e) \(\frac{{11}}{3}\,\, + \,\,\frac{6}{7}\,\, + \,\,\frac{4}{3}\)

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g) \(\frac{9}{{10}}\,\, \times \,\,\frac{5}{6}\,\,:\,\,3\)

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b) \(\frac{{17}}{3}\,\, - \,\,\frac{4}{5}\)

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d) \(\frac{{45}}{{16}}\,\,:\,\,\frac{9}{8}\)

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f) \(\frac{{16}}{{15}}\,\, - \,\,\frac{5}{7}\,\, - \,\,\frac{1}{{15}}\)

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h) \(\frac{7}{{11}}\,\,:\,\,\frac{3}{{22}}\,\,:\,\,\frac{{10}}{6}\)

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\(\frac{1}{2}\,\, \times \,\,\frac{4}{{13}}\,\, = \,\,.....\) (Ơ)

\(4\,\, - \,\,\frac{8}{3}\,\, = \,\,.....\) (Ầ)

\(\frac{3}{2}\,\,:\,\,\frac{6}{5}\,\, = \,\,.....\) (M)

\(\frac{1}{8}\,\, + \,\,\frac{1}{4}\,\, = \,\,.....\) (S)

\(\frac{{16}}{{21}}\,\, \times \,\,\left( {\frac{5}{8}\,\, + \,\,\frac{1}{4}} \right)\,\, = \,\,.....\) (N)

\(\frac{1}{2}\,\, \times \,\,\frac{4}{{13}}\,\, = \,\,.....\) (Ơ)

\(4\,\, - \,\,\frac{8}{3}\,\, = \,\,.....\) (Ầ)

\(\frac{3}{2}\,\,:\,\,\frac{6}{5}\,\, = \,\,.....\) (M)

\(\frac{1}{8}\,\, + \,\,\frac{1}{4}\,\, = \,\,.....\) (S)

\(\frac{{16}}{{21}}\,\, \times \,\,\left( {\frac{5}{8}\,\, + \,\,\frac{1}{4}} \right)\,\, = \,\,.....\) (N)