Question

Me Ajudem Urgente <3

Answer 1

Explicação passo-a-passo:

.

$\dfrac{5}{8} \times \dfrac{1}{3}$

$\dfrac{5}{24}$

.

$\dfrac{3}{5} \times \dfrac{3}{4}$

$\dfrac{9}{20}$

.

$\dfrac{5}{3} \times \dfrac{12}{7}$

$\dfrac{60 \div 3}{21 \div 3}$

$\dfrac{20}{7}$

.

$\dfrac{16}{25} \div \dfrac{8}{15}$

$\dfrac{16}{25} \times \dfrac{15}{8}$

$\dfrac{240 \div 40}{200 \div 40}$

$\dfrac{6}{5}$

.

$\dfrac{10}{14} \div \dfrac{9}{49}$

$\dfrac{10}{14} \times \dfrac{49}{9}$

$\dfrac{490 \div 14}{126 \div 14}$

$\dfrac{35}{9}$

.

$\dfrac{7}{3} \div \dfrac{4}{18}$

$\dfrac{7}{3} \times \dfrac{18}{4}$

$\dfrac{126 \div 6}{12 \div 6}$

$\dfrac{21}{2}$

Answer 2

Multiplicação de frações : podem ser feitas normalmente.

a)

$\frac{5}{8} \times \frac{1}{3} = \frac{5 \times 1}{8 \times 3} = \frac{5}{24}$

b)

$\frac{3}{5} \times \frac{3}{4} = \frac{9}{20}$

c)

$\frac{5}{3} \times \frac{12}{7} = \frac{60}{21} = \frac{20}{7}$

Divisão de frações : conserva a primeira e multiplica pelo inverso da segunda.

d)

$\frac{16}{25} \div \frac{8}{15} = \frac{16}{25} \times \frac{15}{8} = \frac{240}{200} = \frac{12}{10} = \frac{6}{5}$

e)

$\frac{10}{14 } \div \frac{9}{49} = \frac{10}{14} \times \frac{49}{9} = \frac{490}{126} = \frac{245}{63} = \frac{35}{9}$

f)

$\frac{7}{3} \div \frac{4}{18} = \frac{7}{3} \times \frac{18}{4} = \frac{126}{12} = \frac{21}{2}$