Respostas

2014-05-26T21:55:41-03:00
Raiz de 81=9
raiz de 49=7

9-7=2
2014-05-26T21:57:39-03:00
81 | 3
27 | 3
  9 | 3
  3 | 3
  1 | 

√81 = √ 3 x 3 x 3 x 3
√81 = √ 9 x √ 9
√81 = 3 x 3
√81 = 9

49 | 7
  7 | 7
  1 | 

√49 = √ 7 x 7
√49 = √ 49
√49 = 7
1 5 1