Question

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Atividade:

1)Calcule o valor das expressões:

a) 5/8 + ½ -2/3 = b) 5 + 1/3 -1/10 =






c) 7/8 – ½ - ¼ = d) ½ + 1/6 x 2/3 =





e) 3/10 + 4/5 : ½ = f) 7 x ½ + (4/5)² =





g) (1/3)² + 2/5 x ½ = h) (1/2)² : ¾ + 5/3 =

Answer 1

Resposta:

Explicação passo a passo:

1)Calcule o valor das expressões:

a) 5/8 + ½ -2/3

Mmc (8,2,3)=24

= (3.5+12.1 - 8.2)/24

= (15+12-16)/24

= (27-16)/24

= 11/24

_____________

b) 5 + 1/3 - 1/10

Mmc (3,10)= 30

= (30.5+10.1 - 3.1)/30

= (150+10-3)/30

= (150+7)/30

= 157/30

______________

c) 7/8 – ½ - ¼ =

Mmc (8,2,4)= 8

= (7-4-2)/8

= (3-2)/8

= 1/8

_______

d) ½ + 1/6 x 2/3 =

= 1/2 + 2/18 (:2)/(:2)

= 1/2 + 1/9

Mmc(9,2)= 18

= (9+2)/18

= 11/18

______________

e) 3/10 + 4/5 : ½

= 3/10 + 4/5 . 2/1

= 3/10 + 8/5

Mmc (5,10) =10

= (3+2.8)/10

= (3+16)/10

=19/10

_____________

f) 7 x ½ + (4/5)²

= 7/2 + 16/25

Mmc (2,25)= 50

= (25.7+2.16)/50

= (175+72)/50

= 247/50

___________

g) (1/3)² + 2/5 x ½

= 1/9 + 2/5.1/2

= 2/9 + 2/2. 1/5

= 2/9 + 1/5

Mmc (9,5)=45

= (5.2+9)/45

= (10+9)/45

= 19/45

_________

h) (1/2)² : ¾ + 5/3

= 1/4 . 4/3 + 5/3

= 4/4.1/3+5/3

= 1/3+5/3

= 6/3

= 2