Respostas

2014-05-22T00:01:39-03:00
A) X² + Y² = (2)² + (-1)² = 4+1=5

B) (X+Y)² = (2-1)² = 1² = 1


1 3 1
2014-05-22T00:45:09-03:00
A) x²+y² =
(2)² + (-1)² =
4 +1 =
 5

B) (x+y)² =
(2+(-1))² =
4+1=
5
1 2 1