Răspuns:
[tex] a) \:\frac{1}{3} \cdot\Big( \frac{2}{5} + \frac{1}{5} \Big) = \frac{1}{ \not3} \cdot \frac{ \not3}{5} = \bf{\frac{1}{5}} \\ [/tex]
[tex] b) \: \frac{15}{14} + \frac{1}{2} \cdot \frac{5}{7} = \frac{15}{14} + \frac{5}{14} = \frac{20 {}^{(2} }{14} = \bf{ \frac{10}{7} } \\ [/tex]
[tex] c) \: \frac{ \not2}{ \not9} \cdot \frac{ \not3}{ \not4} + \frac{1}{2} \cdot \frac{5}{3} = \frac{1}{3} \cdot \frac{1}{2} + \frac{5}{6} = \frac{1}{6} + \frac{5}{6} = \frac{6}{6} = \bf{ 1 } \\ [/tex]
[tex] d) \: \frac{ \not7}{ \not6} \cdot \frac{16}{\not5} \cdot \frac{\not15}{ \not14} \cdot \not2 = \frac{1}{\not3} \cdot \not16 \cdot \frac{\not3}{\not2} = \bf{8} \\ [/tex]
