Question

A) O dobro de 2/15 B) A metade de 9/10 C) O triplo de 1/2.4/3 D) Dois quintos de 5/12 E) três quartos de 8/7.1/7

Answer 1

a) $\frac{2}{15} \cdot2= \frac{4}{15}$

b) $\frac{9}{10} \cdot \frac{1}{2} = \frac{9}{20}$

c) $\frac{1}{2} \cdot \frac{4}{3} \cdot3= \frac{1\cdot4\cdot3}{2\cdot3} = \frac{12}{6} = 2$

d) $\frac{5}{12} \cdot \frac{2}{5}= \frac{10}{60} = \frac{1}{6}$

e)$\frac{8}{7} \cdot \frac{1}{7} \cdot \frac{3}{4} = \frac{8\cdot1\cdot3}{7\cdot7\cdot4} = \frac{24}{196} = \frac{6}{49}$