Question

Calcule a média entre os seguintes números

A)-3,-4,-6,5 E 7

B)1/3,3/5,2/9 E 4/6

Answer 1

A)
M = (-3 -4 -6 + 5 + 7) / 5
M = -1/5
M = -0,20

B)
(1/3+3/5+2/9+4/6) / 4
Faça o m.m.c. para igualar as bases:
m.m.c.
3,5,9,6|2
3,5,9,3|3
1,5,3,1|3
1,5,1,1|5
1,1,1,1|90

1/3 + 3/5 + 2/9 + 4/6 =   30/90 + 36/90 + 20/90 + 60/90
146/90 = 73/45

M = (73/45) / 4
M = (73/45) / (4/1)
M = (73/45) . (1/4)
M = 73/180 = 0,40555...