Respostas

2013-12-01T15:57:54-02:00
A) (2/5) . (-2/3) = -4 /15
b) (-4) . (-3/11) = 12/11
c) (-6,4) . (1,5) =  - 9,6
d) (1/2) . (3/4) = 3/8
e) (-2) . (-3/4) . (1/7) =  6/4 . 1/7 = 6/28 : 2 =  3/14