Question

Responda:

a) (-2/3)² + ( -2/3) + (-2/3)0

b) ( 2-1/4) – (3 -1/2)

c) (¾ – 5/6) : (½ + ¼)

d) ( -1+1/2) . (-2 – ¾)

2) Calcule:

a) ( 1/3) : (- 2/5)

b) (-4/7) : (-1/2)

c) -6 : ( + 7/3)

d) ( - 5/2) : 3

e)50: ( 7-12)

f) ( 20 – 14) : ( -2)

g) ( 35 – 15) : 4

h) (7 – 3- 10) : ( 5-6)​

Answer 1

Resposta:

A) (-2/3)² + (-2/3) + (-2/3)°=  todo número elevado a zero é igual a 1

(-2/3) x (-2/3) + (-2/3) + 1 =

(4/9) + (-2/3) +1 =  tira/se o m.m.c.(9,3)= 9

9÷9=1 x 4=4

9÷3= 3 x (-2)= (-6)

9÷1=9 x 1=9

(4/9) + (-6/9) + (9/9)= 7/9

B)( 2 -1/4) - (3 -1/2)=

(8 - 1)/4 - (6-1)/2=

(7/4) - (4/2)=  m.m.c.(4,2)=4

(4÷4)=1 x 7= 7/4

(4÷2)=2 x 4= 8/4

(7/4) - (8/4)= -1/4

C)(3/4 - 5/6) ÷ (1/2  +  1/4)= m.m.c.(4,6)=12 e o m.m.c.(2,4)=4

(12÷4)= 3 x 3=9/12

(12÷6)=2 x (-5)= (-10/12)

(4÷2)=2 x 1=2/4

(4÷4)=1 x 1= 1/4  

{(9/12) + (-10/12)} ÷ {(2/4) + (1/4})=   m.m.c.(12,4)=12

(12÷12)=1 x 9=9/12

(12÷12)=1 x (-10)=(-10)/12

{(9/12) + (-10/12)}÷{(2/4)+(1/4)}=

(-1/12)÷(3/4)= (-1/12) x (4/3)=(-4/36)÷4 =(-1/9)

D(-1+1/2).(-2 -3/4)=

(-1/2).(-11/4)=11/8

2)

A)(1/3)÷(-2/5)=

(1/3) x (-5/2)=(-5/6)

B)(-4/7)÷(-1/2)=

(-4/7) x (-2/1)=8/7

C) -6÷(7/3)=

-6 x 3/7= -18/7

D)(-5/2)÷3=

(-5/2) x 1/3=(-5/6)

E)50÷(7-12)=

50÷ (-5)= -10

Explicação passo-a-passo: