Question

RESOLVA USANDO A TÉCNICA DE CANCELAMENTO AJUDAAAA RAPIDOOOO 40 PONTOSSSSS​

Answer 1

Espero ter ajudado.

A

$\frac{4}{12}\cdot \frac{3}{5}$

$\frac{4}{4}\cdot \frac{1}{5}\\\\\frac{4\cdot \:1}{4\cdot \:5}\\\\=\frac{1}{5}$

B

$\frac{81\cdot \:2}{8\cdot \:9}\\\\\frac{81\cdot \:2}{8\cdot \:9}\\\\\frac{162}{8\cdot \:9}\\\\\frac{162}{72}\\\\\frac{9}{4}$

C

$\frac{32}{15}\cdot \frac{3}{24}\\\\\frac{1}{8}\cdot \frac{32}{15}\\\\\frac{4}{15}$

D

$\frac{16}{12}\cdot \frac{15}{25}\\\\\frac{16}{4}\cdot \frac{5}{25}\\\\\frac{16\cdot \:5}{4\cdot \:25}\\\\\frac{80}{4\cdot \:25}\\\\\frac{80}{100}\\\\\frac{4}{5}$