3) Calcule:
a) (2/5) . (-2/3)
b) (-4) . (-3/11)
c) (-6,4) . (1,5)
d) (1/2) . (3/4)
e) (-2) . (-3/4) . (1/7)
Soluções para a tarefa
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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
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
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