Respostas

2014-05-14T17:52:31-03:00
1)

1 / (1+√2) - √2 / (2) = x

2 / (1+√2) - √2 = 2x

2 - √2 . (1+√2) = 2x . (1+√2)

2 - √2 - 2 = 2x + 2√2x

-√2 = 2x + 2√2x

-√2 = x . (2+2√2)

-√2 / (2+2√2) = x

-√2 / (2+√8) = x

-√2 . (2-√8) / (4 - 8) = x

-2√2 + √16 / -4 = x

-2√2 + 4 / -4 = x

(√2/2) -1 = x

2)

(t²+2t+1) / (t²-1) =

(t+1)² / (t²-1) = 

(t+1)² / (t-1) . (t+1) = 

(t+1) / (t-1)