Question

Calcule:

a)4x1/9=
b)3x2/13=
c)5x3/20=
d)3x3/10=​

Answer 1

Olá!

$a) \: 4 \times \frac{1}{9} = \\ \\ \frac{4}{\color{red}{1}} \times \frac{1}{9} = \\ \\ \frac{4 \times 1}{ 1\times 9} = \\ \\ \bf{ \frac{4}{9} }$

$b) \: 3 \times \frac{2}{13} = \\ \\ \frac{3}{\color{red}{1}} \times \frac{2}{13} = \\ \\ \frac{3 \times 2}{1 \times 13} = \\ \\ \bf{ \frac{6}{13} }$

$c) \: 5 \times \frac{3}{20} = \\ \\ \frac{5}{\color{red}{1}} \times \frac{3}{20} = \\ \\ \frac{5 \times 3}{1 \times 20} = \\ \\ \frac{ {15}^{\color{red}{ \div 5}} }{ {20}^{\color{red}{ \div 5}} } = \\ \\ \bf{ \frac{3}{4} }$

$d) \: 3 \times \frac{3}{10} = \\ \\ \frac{3}{\color{red}{1}} \times \frac{3}{10} = \\ \\ \frac{3 \times 3}{1 \times 10} = \\ \\ \bf{ \frac{9}{10} }$

Espero ter ajudado! :)