Question

Resolva as expressões numéricas e simplifique o resultado quando possível.



A): (-4/5) · (35/16) + 5/4


B):(10/3) : (-5/4) - 8/7


C):(4 -1/3):(4+1/2)


D):(2/5-1/4) · (1/3-1) · (-2-4/5)

Answer 1

A)
= (-4/5) · (35/16) + 5/4
= -4/16 . 35/5 + 5/4
= -1/4 . 7 + 5/4
= - 7/4 + 5/4
= -2/4 (:2)/(:2)
= - 1/2

B)
= (10/3) : (-5/4) - 8/7
= 10/3 . (-4/5) - 8/7
= 10/5 . (-4/3) - 8/7
= 2. (-4/3) - 8/7
= -8/3 - 8/7
= [(-7.8 - 3.8)/21]
= [(-56-24)/21]
= - 80/21

C)
= (4 -1/3):(4+1/2)
= [(3.4 - 1)/3] : [(2.4+1)/2]
= [(12-1)/3] : [(8+1)/2]
= 11/3 : 9/2
= 11/3 . 2/9
= 22/27

D)
= (2/5 - 1/4) · (1/3 - 1) · (- 2 - 4/5)
= [(4.2 - 5.1)/20] . [(1 - 3)/3] . [(-5.2 - 4)/5]
= [(8-5)/20] . [-2/3] . [(-10-4)/5]
= 3/20 . (-2/3) . (-14/5)
= 3/3 . (-2/20) . (-14/5)
= 1. (-1/10) . (-14/5)
= 14/50 (:2)/(:2)
= 7/25

Answer 2

respostas: .....

1/2

80/21

22/27

7/25