Question

me ajudem, trabalho de matemática, apresentem os cálculos

Answer 1

Resposta:

a) - 5/12

b) -9/140

c)  35/42

d) 0

e) 539/35

f) - 1/20

Explicação passo-a-passo:

a) (-1/2)³ -1/4 . [2/3 -(-2/2 + 1/2)] =

-1³/2³ - 1/4 . [2/3 -(-1/2)] =

-1/8 - 1/4 . [2/3 + 1/2] =           Eliminando os colchetes: mmc(2,3) = 6

-1/8 - 1/4 . [2.2/6 + 3.1/6] =

-1/8 - 1/4 . [4/6 + 3/6] =

-1/8 - 1/4 .7/6 =

-1/8 - 7/24 =            mmc(8,24) = 24

3.-1/24 - 1.7/24 =

-3/24 - 7/24 =

- 10/24 =      (:2)

- 5/12

b) -3/7 . √36/100 + 1/2 : 14/9 =

-3/7 . √36/√100 + 1/2 . 9/14 =

-3/7 . 6/10 + 9/28 =        

-18/70 + 9/28 =                  mmc(70,28) = 140

2.-18/140 + 5.9/140 =

-36/140 + 45/140 =

-9/140

c) A = [1/2 - (1 + 1/2)²] . (2 - 2/3)                      B = 5/7 : [2 - (2/3 + 3)]

A = [1/2 - (3/2)²] . 4/3                                      B = 5/7 : [2 - 12/3]

A = [1/2 - 9/4] . 4/3                                         B = 5/7 : -6/3

Eliminando os colchetes: mmc(2,4) = 4       B = 5/7 . -3/6

A = [2.1/4 - 1.9/4] . 4/3                                    B = - 15/42  (:3)

A = [2/4 - 9/4] . 4/3                                        B = - 5/14

A = - 7/4 . 4/3

A = - 28/12  (:4)

A = - 7/3

Calculando A. B

-7/3 . -5/14 = 35/42

d) [(-1/2)^4 : (-1/2)³] . (-1/2)^6 + 2^-7 =

[1/16 : -1/8] . 1/64 +  1/128 =

[1/16 . -8] . 1/64 + 1/128 =

- 8/16. 1/64 + 1/128 =

- 8/1024 + 1/128 =     mmc(1024,128) = 1024

1.-8/1024 + 8.1/1024 =

-8/1024 + 8/1024 =

0

e) (-1 + 1/5)² : (0,4 - 1/5)² - 0,7.√36/49 =

(-4/5)² : (4/10 - 1/5)² - 7/10 . 6/7 =        mmc(10,5) = 10

16/25 : (1.4/10 - 2.1/10)² - 42/70 =

16/25 : (4/10 - 2/10)² - 42/70 =

16/25 : (2/10)² - 42/70 =

16/25 : 4/100 - 42/70 =

16/25 . 100/4 - 42/70 =

1600/100 - 42/70 =     mmc(100,70) = 700

7.1600/700 - 10.42/700 =

11200/700 - 420/700 =

10780/700 =  (:20)

539/35  

f) 1/2 - 0,8 + 3/4 - √1/4 =

1/2 - 8/10 + 3/4 - 1/2 =      mmc(2,10,4) = 20

10.1/20 - 2.8/20 + 5.3/20 - 10.1/20 =

10/20 - 16/20 + 15/20 - 10/20 =

- 1/20