Respostas

2014-07-21T18:42:27-03:00
5² = ( 5 x 5)         √49 = 7       2³ = ( 2x2x2) 
( 25 - 21) + ( 7 + 6) x 2 - 8 =

4 + 13 x 2 - 8 =

4 + 2 6 - 8 =

30 - 8 =

22
2 4 2