Question

Va rog ex 10 repede!Dau coroana​

Answer 1

a) x = {-7,7}

b) x = [-5,5] = {-5,-4,-3,-2,-1,0,1,2,3,4,5}

c) x = 0

d) x = 0

e) multima vida

f) |x| = |x| cum relatia e adevarata, x apartine R

g) |x| = -|x| pt x =0

h) x >/ 0 , x = {0,1,2,3......}

i) |x| +x = 0

x + x = 0, x >/ 0

-x+x =0, x < 0

x = 0

x apartine R, x < 0  

x = {-infinit, 0]

Answer 2

a)

$|x| = 7$

x={-7;7}

b)

$|x| \leqslant 5$

-5<=x<=5

x={-5;-4;-3;-2;-1;0;1;2;3;4;5}

c)

$|x| \leqslant 0$

x={0}

d)

$|x| = 0$

x=0

e)

$|x| < 0$

x=mulțimea vidă

f)

$| - x| = |x|$

x=€ Z

(pt orice număr întreg x)

g)

$| - x| = - |x|$

FALS pt orice x diferit de 0

x=0

h)

$|x| =x$

pt orice x număr pozitiv (natural)

x={0;1;2;3;4;...;+infinit}

x€N

i)

$|x| = - x$

pt. orice x număr negativ

x={-infinit;-4;-3;-2;-1;0}