Question

determine o valor numérico das expressões:
a) -5/6 . (1 - 3/5) =

b) 2 . (3/4 - 5/2) - 3 . (2 - 7/3)

c) (3/2 . 1/4 - 5/2) (1 - 5/2 . 4/3)

Answer 1

a)
-5/6 . (1 - 3/5)
-5/6 . (2/5)
-10/30 = -1/3

b)
2 . (3/4 - 5/2) - 3 . (2 - 7/3)
2 . (-14/8) - 3 . (-1/3)
-28/8 - (-3/3)
-28/8 + 3/3
-28/8 + 1
-28/8 + 8/8
-20/8

c)
(3/2 . 1/4 - 5/2).(1 - 5/2 . 4/3)
(3/8 - 5/2) . (1 - 20/6)
(-34/16) . (-14/6)
(-17/8) . (-7/3)
119/24