Question

efetue,utilizando o cancelamento
a)3/5.5/7
b)7/11.11/28
c)36/50.30/72.10/40
d)3/5.14/9.10/49​

Answer 1

Resposta:

letra a)

$\frac{3}{5 \div 5} \times \frac{5 \div 5}{7} = \frac{3}{1} \times \frac{1}{7} = \frac{3}{7}$

letra b)

$\frac{7 \div 7}{11 \div 11} \times \frac{11 \div 11}{28 \div 7} = \frac{1}{1} \times \frac{1}{4} = \frac{1}{4}$

letra c)

$\frac{36 \div 36}{50 \div 10} \times \frac{30 \div 10}{72 \div 36} \times \frac{10}{40} = \\ \frac{1}{5 \div 5} \times \frac{3}{2} \times \frac{10 \div 5}{40} = \\ \frac{1}{1} \times \frac{3}{2 \div 2} \times \frac{2 \div 2}{40} = \\ \frac{1}{1} \times \frac{3}{1} \times \frac{1}{40} = \\ \frac{3}{40}$

letra d)

$\frac{3 \div 3}{5 \div 5} \times \frac{14 \div 7}{9 \div 3} \times \frac{10 \div 5}{49 \div 7} = \\ \frac{1}{1} \times \frac{2}{3} \times \frac{2}{7} = \\ \frac{4}{21}$