Respostas

2014-08-30T12:40:03-03:00
A) 
(7-2i)+(5-3i)=12-5i

b)
(5-3i)+(2+5i)=7+2i

c)
(2+5i)+(7-2i)=9+3i

d)
(7-2i)-(5-3i)=2+i