6) 17/36 * 54/85 7) 63/80 * 40/81 8) 29/42 * 56/87 11) 45/56 : 27/40 12) 33/52 : 11/26 13) 28/39 : 56/65

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6) 17/36 * 54/85 7) 63/80 * 40/81 8) 29/42 * 56/87 11) 45/56 : 27/40 12) 33/52 : 11/26 13) 28/39 : 56/65

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6) $\frac{17}{36} \cdot \frac{54}{85} = \frac{17 \cdot 54}{36 \cdot 85} = \frac{1 \cdot 3}{2 \cdot 5} = \frac{3}{10} = 0,3$ 7) $\frac{63}{80} \cdot \frac{40}{81} = \frac{63 \cdot 40}{80 \cdot 81} = \frac{7 \cdot 1}{2 \cdot 9} = \frac{7}{18}$ 8) $\frac{29}{42} \cdot \frac{56}{87} = \frac{29 \cdot 56}{42 \cdot 87} = \frac{1 \cdot 4}{3 \cdot 3} = \frac{4}{9}$ 11) $\frac{45}{56} : \frac{27}{40} = \frac{45}{56} \cdot \frac{40}{27} = \frac{45 \cdot 40}{56 \cdot 27} = \frac{5 \cdot 5}{7 \cdot 3} = \frac{25}{21} = 1\frac{4}{21}$ 12) $\frac{33}{52} : \frac{11}{26} = \frac{33}{52} \cdot \frac{26}{11} = \frac{33 \cdot 26}{52 \cdot 11} = \frac{3 \cdot 1}{2 \cdot 1} = \frac{3}{2} = 1,5$ 13) $\frac{28}{39} : \frac{56}{65} = \frac{28}{39} \cdot \frac{65}{56} = \frac{28 \cdot 65}{39 \cdot 56} = \frac{1 \cdot 5}{3 \cdot 2} = \frac{5}{6}$

6) 17/36 * 54/85 7) 63/80 * 40/81 8) 29/42 * 56/87 11) 45/56 : 27/40 12) 33/52 : 11/26 13) 28/39 : 56/65

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