Respostas

2014-01-29T10:09:00-02:00
A) m² - 2mn + n²
(-2)² - 2.(-2).1/4 + (1/4)² = 
4 + 4.1/4 + 1/16 = 
4 + 1 + 1/16 = 
(64/16 + 16/16 + 1/16) = 
81/16