Respostas

2013-07-14T21:41:46-03:00
(-2,5)² = (-2,5) . (-2,5) = 
                 6,25
              
1 5 1
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2013-07-14T21:42:03-03:00
-2,5² = -2,5 x -2,5= 6,25
1 3 1