Răspuns:
[tex]3) \: a) \: 3 \times \frac{1}{5} \times 8 \times \frac{3}{4} = \frac{16}{5} \times \frac{35}{4} = 4 \times 7 = 28 \\ \\ b) 1 \times \frac{2}{7} \times 1 \times \frac{13}{15} = \frac{9}{7} \times \frac{28}{15} = \frac{12}{5} [/tex]
[tex]c) \: 5 \times \frac{5}{8} \times 1 \times \frac{7}{25} = \frac{45}{8} \times \frac{32}{25} = \frac{36}{5} \\ d) \: 3 \times \frac{3}{13} \times 2 \times \frac{11}{14} = \frac{42}{13} \times \frac{39}{14} = 9[/tex]
[tex]4) \: a) \: \frac{12}{20} \times \frac{4}{6} \times \frac{5}{22} = \frac{240}{2640} = \frac{1}{11} \\ b) \: \frac{22}{36} \times \frac{1}{3} \times \frac{81}{11} = \frac{1782}{1188} = \frac{ 3}{2} [/tex]
[tex]c) \: \frac{50}{26} \times \frac{1}{10} \times \frac{2}{15} = \frac{100}{3900} = \frac{1}{39} [/tex]
[tex]d) \: 3 \times \frac{1}{4} \times 1 \times \frac{1}{3} \times \frac{1}{13} = \frac{13}{4} \times \frac{4}{3} \times \frac{1}{13} = \frac{1}{3} [/tex]
