[tex] \frac{ 9}{14} \times 1 \frac{13}{15} = \\ \\ \frac{ 9}{14} \times \frac{1 \times 15 + 13}{15 } = \\ \\ \frac{ 9}{14} \times \frac{28}{15 } = \\ \\ \frac{ 252}{210} simplificam \: cu \: 3 = \\ \\ \frac{ 84}{70} simplificam \: cu \: 2 = \\ \\ \frac{ 42}{35} [/tex]
[tex] \frac{ 8}{12} \times 8 \frac{3}{4} = \\ \\ \frac{ 8}{12} \times \frac{8 \times 4 + 3}{14 } = \\ \\ \frac{ 8}{12} \times \frac{35}{14} = \\ \\ \frac{ 280}{168} simpificam \: cu \: 2 = \\ \\ \frac{ 140}{84} simplificam \: cu \: 2 = \\ \\ \ \frac{ 70}{42} simplificam \: cu \: 2 = \\ \\ \frac{ 35}{21} [/tex]
