Question

13) Calcule as expressões:
a) (-1/2)2 + 2/5 =
b) (-1/2)3 + 1 =
c) (2/5)2 - (-1/2)3 =
d) 2 + (-1/3)2 - (1/2) =
e) 1 + (+2/5) - (22)2 =​

Answer 1

Resposta:

a)  

b)

c)

d)

e)

Explicação passo-a-passo:

a) (-1/2)2 + 2/5 =  1/4 + 2/5 = 5/20 + 8/20 = 13/20

b) (-1/2)3 + 1 =  -1/8 + 1 = -1/8 + 8/8 = 7/8

c) (2/5)2 - (-1/2)3 =  4/25 - (-3/6) = 4/25 + 3/6 = 24/150 + 75/150 = 99/150

d) 2 + (-1/3)2 - (1/2) =  2+1/9-1/2 = 18/9+1/9-9/18 = 19/9-9/18 = 38/18-9/18 = 29/18

e) 1 + (+2/5) - (22)2 = 5/5+2/5-484 = 7/5-484/1 = 7/5-2420/5 = -2413/5