Question

1. Calcule o valor das expressões.
a) [-3 + 2] + [7 - 10] - [5-8]

b) [ 10 - 5+ 1] - 1[-14 - 18] + [ 10 - 48]
2
c) [ x ] - [x] + [x], para x = - 4
2 2
d) [x] e [x], para x = -4

respondam pfv​

Answer 1

Explicação passo-a-passo:

a)

$\sf |-3+2~|+|~7-10~|-|~5-8~|$

$\sf =|-1~|+|-3~|-|-3~|$

$\sf =1+3-3$

$\sf =4-3$

$\sf =\red{1}$

b)

$\sf |~10-5+1~|-|~-14-18~|+|~10-48~|$

$\sf =|~6~|-|-32~|+|-38~|$

$\sf =6-32+38$

$\sf =-26+38$

$\sf =\red{12}$

c)

$\sf |~x~|^2-|~x~|+|~x~|$

$\sf =|-4~|^2-|-4~|+|~-4~|$

$\sf =4^2-4+4$

$\sf =16-4+4$

$\sf =12+4$

$\sf =\red{16}$

d)

$\sf |~x^2~|=|~(-4)^2~|=|~16~|=\red{16}$

$\sf |~x~|^2=|-4~|^2=4^2=\red{16}$

Answer 2

Oie, Td Bom?!

a)

$= | - 3 + 2| + |7 - 10| - |5 - 8|$

$= | - 1| + | - 3| - | - 3|$

$= 1 + 3 - 3$

$= 4 - 3$

$= 1$

b)

$= |10 - 5 + 1| - | - 14 - 18| + |10 - 48|$

$= |11 - 5| - | - 14 - 18| + |10 - 48|$

$= |6| - | - 32| + | - 38|$

$= 6 - 32 + 38$

$= 44 - 32$

$= 12$

c)

$= | x| {}^{2} - |x| + |x|$

$= | - 4| {}^{2} - | - 4| + | - 4|$

$= | - 4| {}^{2}$

$= 4 {}^{2}$

$= 4 \: . \: 4$

$= 16$

d)

$|x {}^{2} | = | - 4 {}^{2} | = 4 {}^{2} = 4 \: . \: 4 = 16$

$|x| {}^{2} = | - 4| {}^{2} = 4 {}^{2} = 4 \: . \: 4 = 16$

Att. Makaveli1996