Question

Voce pode me ajudar ???É URGENTE!

Answer 1

Temos:

• $a=-\frac{3}8}(-\frac{4}{3})$

• $b=-\frac{7}{10}*\frac{5}{7}$

$a+b=[-\frac{3}8}(-\frac{4}{3})]+[-\frac{7}{10}*\frac{5}{7}]\\\\a+b=(\frac{3*4}{8*3})+(-\frac{7*5}{10*7})\\\\a+b=\frac{12}{24}-\frac{35}{70}\\\\a+b=\frac{1}{2}-\frac{1}{2}\\\\a+b=0$