b) Minh thu gom được \(\frac{3}{2}\) kg giấy vụn. Lan thu được ít hơn Minh \[\frac{1}{4}\] kg giấy vụn. Đức thu gom được nhiều hơn Lan \(\frac{3}{4}\) kg giấy vụn. Vậy cả ba bạn thu gom được số ki – lô – gam giấy vụn là:

a) \(\frac{9}{5}\,\, + \,\,\frac{1}{10}\)

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d) \(\frac{{17}}{3}\,\, - \,\,\frac{4}{15}\)

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

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

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c) \(\frac{{11}}{3}\,\, + \,\,\frac{6}{7}\,\, + \,\,\frac{4}{21}\)

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

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

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

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