Question

Efetue as multiplicações:

A) (+1/5)•(+4/3)

B) (+4/9)•(-7/5)

C) (-3/2)•(-5/7)

D) (-1/5)•(+1/4)

E) (+2/3)•(-1/3)

F) (-5/8)•(-4/3)

Answer 1

Oi...

a)

(+ 1/5).(+ 4/3)  ⇒ + com + = +

4/15

b)

(+ 4/9).(- 7/5)  ⇒ + com - = -

- 28/45

c)

(- 3/2).(- 5/7)  ⇒ - com - = +

15/14

d)

(- 1/5).(+ 1/4)  ⇒ - com + = -

- 1/20

e)

(+ 2/3).(- 1/3)  ⇒ + com - = -

- 2/9

f)

(- 5/8).(- 4/3) ⇒ - com - = +

20/24 ÷ 4

5/6

Espero ter ajudado.