Efetue as multiplicações simplificando-as: a)2.5/3=b)3.2/5=c)1...

a) (5 – 3i) + (–3 + 4i)

5 – 3i – 3 + 4i = 5 – 3 – 3i + 4i = 2 + i

b) (7i – 5) – (–2 – 8i)

7i – 5 + 2 + 8i = –5 + 2 + 8i + 7i = –3 + 15i

c) (2i – 4) ∙ (3 + 6i)

6i + 12i

2 – 12 – 24i = 12i

2 –18i –12 =

12 ∙ (–1) – 18i – 12 = –24 – 18i

d) (8 + i) ∙ (8 – i)

(64 – i 2 ) = 64 – (–1) = 65