Resposta:
a) 1/2 + 3/2= 4/2 = 2
b) 4/6 - 1/6= 3/6 = 1/2
c) 3/4 + 1= 3/4 + 4/4 = 7/4
d) 2- 2/3= 6/3 - 2/3 = 4/3
e) 4/5 × 3/4= [tex]\frac{4}{5} *\frac{3}{4}[/tex] = 3/5
f) 6/7 : 2/3= [tex]\frac{6}{7} * \frac{3}{2}[/tex] = [tex]\frac{3}{7} * 3[/tex] = 9/7