Question

12) Calcule: 3/5 x 20/9 : 2/3


13) Calcule 14/5 : 21/10 x 18/4
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Answer 1

Resposta:

12) 2

13) 6

Explicação passo-a-passo:

12) $\frac{3}{5}\times \frac{20}{9}\div \frac{2}{3} = \frac{3\times \:20\times \:3}{5\times \:9\times \:2} = \frac{180}{5\times \:9\times \:2} = \frac{180}{90} = 2$

13) $\frac{14}{5}\times \frac{10}{21}\times \frac{18}{4}$   Simplificando a fração $\frac{18}{4}$, temos $\frac{9}{2}$

$=\frac{9}{2}\times \frac{14}{5}\times \frac{10}{21} = =\frac{14\times \:10\times \:9}{5\times \:21\times \:2} = \frac{1260}{5\times \:21\times \:2} =\frac{1260}{210} = 6$