Question

B) 2/5.6/8-1/4=

C) 9/3.3/3=

D) 5/2.4/5=

E)(-45/19).(48/18)=

F)(-36/15).(-50/12)=​

Answer 1

Explicação passo a passo:

$B)\frac{2}{5}\cdot \frac{6}{8}-\frac{1}{4}=\frac{3}{10}-\frac{1}{4}=\frac{6-5}{20}=\frac{1}{20}$

$C)\frac{9}{3}\cdot \frac{3}{3}=\frac{9}{3}=3$

$D)\frac{5}{2}\cdot \frac{4}{5}=\frac{4}{2}=2$

$E)\left(-\frac{45}{19}\right)\cdot \left(\frac{48}{18}\right)=-\frac{45}{19}\cdot \frac{48}{18}=-\frac{45}{19}\cdot \frac{8}{3}=-\frac{45\cdot \:8}{19\cdot \:3}=-\frac{15\cdot \:8}{19}=-\frac{120}{19}$

$F)\left(-\frac{36}{10}\right)\left(-\frac{50}{12}\right)=\frac{36}{10}\cdot \frac{50}{12}=\frac{18}{5}\cdot \frac{25}{6}=\frac{18\cdot \:25}{5\cdot \:6}=\frac{450}{30}=15$