Question

efetue as multiplicações

a) 5/2 . 7/4

b) 1/6 . 3/4

c) 2/7 . 8/9

d) 5/9 . 3/6​

Answer 1

Multiplicação de frações

$a) \: \frac{5}{2} \cdot \frac{7}{4} = \\ \\ \frac{5\cdot7}{2\cdot4} = \\ \\ \bf{ \frac{35}{8} }$

$b) \: \frac{1}{6} \cdot \frac{3}{4} = \\ \\ \frac{1\cdot3}{6\cdot4} = \\ \\ \frac{ {3}^{\color{red} { \div 3}} }{ {24}^{\color{red} { \div 3}} } = \\ \\ \bf{ \frac{1}{8} }$

$c) \: \frac{2}{7} \cdot \frac{8}{9} = \\ \\ \frac{2 \cdot8}{7 \cdot9 } = \\ \\ \bf{ \frac{16}{63} }$

$d) \: \frac{5}{9} \cdot \frac{3}{6} = \\ \\ \frac{5 \cdot 3}{9 \cdot 6} = \\ \\ \frac{ {15}^{\color{red} { \div 3}} }{ {54}^{\color{red} { \div 3}} } = \\ \\ \bf{ \frac{5}{18} }$

Espero ter ajudado! :)

Answer 2

A) 35/8

B) 3/24 simplificando 1/8

C) 16/63

D) 15/54