Resposta:
segue as respostas dos exercícios
Explicação passo a passo:
a) -3/4 . - 2/5
= + (3.2)/4.5
= 6/20
= 3/10
b) 5/7 . - 3/6
= 5/7 . - 1/2
= - 5/14
c) - 3/4 . -2/6 . - 6/5
= - ( 3. 2. 6) / 4. 6. 5
= - 36/ 120
= - 3/10
d) 7/9 : -2/3
= 7/9 . - 3/2
= - ( 7.3)/9.2
= - 21/18
= - 7/6
e)- 3/4 : - 2/5
= 3/4 . 5/2
= 15/8
f) 12/5 : - 6/15 : - 1/2
= 12/5 . 15/6 . 2
= (12. 15. 2)/ 5. 6
=360 /30
= 12
g) (-1,23) . (2,9)
= - 3,567
h) (26,1).(2,5)
= 65,25
i ) (-7,4) .(-3,51)
= 25,974
j) (0,02) .(3)
= 0,06
k) 7 . (-3,25)
=-22,75
l)(2,25) : 0,25
= 9
m) (-35,16 ) : (-0,2)
= 175,8
