Question

Qual o valor das expressões:
a)(-5).(-1/3).(+3)

b)1/6.(-3/4).(-10/13).2/5

c)(4/5 - 3/5).1/7

d)(2- 1/2).(1/3-1)

e) Se X= 3/2, Y= - 1/4 e Z= 7, então qual o valor de X.Y.Z ?

f)1/3-1/10.4/3

g)1-5.(3/4 - 2/5)+3/4

h)(1- 1/2).(1- 1/3).(1- 1/4)

i)Se X= -5/2, então qual o valor de 2x+8?

j) $( \frac{3}{7}- \frac{2}{3}) X1 \frac{2}{5}$

Answer 1

a)(-5).(-1/3).(+3)
(-5) . (-1)
R: 5

b)1/6.(-3/4).(-10/13).2/5
1/3 . (-3/4) . (-10/13) . 1/5
1 . (-1/4) . (-10/13) . 1/5
10/260
R: 1/26

c)(4/5 - 3/5).1/7
1/5 . 1/7
R: 1/35

d)(2- 1/2).(1/3-1)
3/2 . (-2/3)
R: -1

e) Se X= 3/2, Y= - 1/4 e Z= 7, então qual o valor de X.Y.Z ?
3/2 . (-1/4) . 7
R: -21/8

f)1/3 - (1/10.4/3)
1/3 - (1/5.2/3)
1/3 - 2/15
5/15 - 2/15
R: 3/15

g)1-5.(3/4 - 2/5)+3/4
1 - 5. (15/20 - 8/20) + 3/4
1 - 5. 7/20 + 3/4
1 - 35/20 +3/4
-15/20 +3/4
-15/20 + 15/20
R: 0

h)(1- 1/2).(1- 1/3).(1- 1/4)
1/2 . 2/3 . 3/4
6/24
R: 1/4

i)Se X= -5/2, então qual o valor de 2x+8?
2 (-5/2) + 8 =
= -10/2 + 8 =
= -10/2 + 8/1 =
= -10/2 + 16/2 =
= 6/2
R: 3

j) (3/7 - 2/3) . 1 2/5
mmc de 7 e 3 é 21
(9/21 - 14/21) . 7/5
-5/21 . 7/5
-7/21
-1/3