Question

3) Observe o quadro dos sinais e, em seguida, calcule o resultado das expressões sempre que possível. a) 2/3 . 1/5= b) 1/2 . (-1/5)= c) 1/3 . (-4/7)= d) 3/5 . (-1/4)= e) 2/3 . (-3/5)= f) 1/2 . (-4/7)=

Answer 1

Resposta:

a)2/15

b)-1/10

c)-4/21

d)-3/35

e)-6/15

f)-4/14

Answer 2

Oie, Td Bom?!

a)

= 2/3 . 1/5

= [2 . 1]/[3 . 5]

= 2/15

b)

= 1/2 . (- 1/5)

= - 1/2 . 1/5

= - [1 . 1]/[2 . 5]

= - 1/10

c)

= 1/3 . (- 4/7)

= - 1/3 . 4/7

= - [1 . 4]/[3 . 7]

= - 4/21

d)

= 3/5 . (- 1/4)

= - 3/5 . 1/4

= - [3 . 1]/[5 . 4]

= - 3/20

e)

= 2/3 . (- 3/5)

= - 2/3 . 3/5

= - 2 . 1/5

= - 2/5

f)

= 1/2 . (- 4/7)

= - 1/2 . 4/7

= - 2/7

Att. Makaveli1996