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\(\frac{11}{17}\) : \(\frac{33}{34}\) = \(\frac{11}{17}\) x \(\frac{34}{33}\) = \(\frac{374}{561}\) = \(\frac{2}{3}\)
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\(\frac{21}{11}\times\frac{22}{17}:\frac{42}{34}\)
\(=\frac{44}{17}:\frac{42}{34}\)
\(=\frac{44}{21}\)
Hok tốt
\(\frac{21}{11}.\frac{22}{17}\div\frac{42}{34}\)
\(=\frac{21}{11}.\frac{22}{17}.\frac{34}{42}\)
\(=\frac{21.22.34}{11.17.42}\)
\(=\frac{21.11.2.17.2}{11.17.2.21}\)
\(=2\)
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\(\dfrac{7}{9}\cdot\dfrac{3}{35}=\dfrac{7}{3\cdot3}\cdot\dfrac{3}{7\cdot5}=\dfrac{1}{15}\)
\(\dfrac{9}{22}\cdot55=\dfrac{9}{11\cdot2}\cdot11\cdot5=\dfrac{45}{2}\)
\(\dfrac{11}{17}:\dfrac{33}{34}=\dfrac{11}{17}\cdot\dfrac{34}{33}=\dfrac{11\cdot17\cdot2}{17\cdot11\cdot3}=\dfrac{2}{3}\)
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\(\frac{7}{9}\cdot\frac{3}{5}=\frac{7\cdot3}{9\cdot5}=\frac{7\cdot1}{3\cdot5}=\frac{7}{15}\)
\(\frac{9}{22}\cdot55=\frac{9}{22}\cdot\frac{55}{1}=\frac{9\cdot55}{22\cdot1}=\frac{9\cdot5}{2\cdot1}=\frac{45}{2}\)
\(\frac{11}{17}:\frac{33}{34}=\frac{11}{17}\cdot\frac{34}{33}=\frac{11\cdot34}{17\cdot33}=\frac{1\cdot2}{1\cdot3}=\frac{2}{3}\)
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a) \(\frac{9}{22}.\frac{33}{18}=\frac{9.33}{22.18}=\frac{297}{396}=\frac{3}{4}\)
b) \(\frac{12}{35}:\frac{36}{25}=\frac{12}{35}.\frac{25}{36}=\frac{12.25}{35.36}=\frac{300}{1260}=\frac{5}{21}\)
c) \(\frac{19}{17}:\frac{76}{51}=\frac{19}{17}.\frac{51}{76}=\frac{19.51}{17.76}=\frac{969}{1292}=\frac{3}{4}\)
\(\frac{9}{22}\cdot55=\frac{9\cdot55}{22}=\frac{495}{22}=\frac{45}{2}\)
\(\frac{11}{17:\frac{33}{34}}=\frac{11}{17\cdot\frac{34}{33}}=\frac{11}{\frac{578}{33}}=\frac{363}{578}\)