Respostas

2014-04-23T22:02:10-03:00
Lembrando que i² = -1
y = 2(1+i) / (1-i)
(x + y)² = (1+i + 2 + 2i)² / (1-i)²
= (9 + 9i² +18i)/(1 + i² - 2i)
= 18i / -2i = -9 (resp)
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