Respostas

2013-12-02T09:50:46-02:00
PA = (x+1)2, 7x, 9x-1

r = 7x - (x+1)2 = 9x-1 - 7x
r = 7x - 2x - 2 = 9x - 1 - 7x
r = 3x = 1
r = 1/3

7x + 1/3 = 9x - 1
1 + 1/3 = 2x
4/3 / 2 = x
x = 4/6
x = 2/3