Question

7. Determinaţi mulţimile:
a) A={reZ||x|sV11};
c) C={xe Z_ ||x|sv17};
b) B={xeN\|x| d) D={xe N√2<\x\<-

Answer 1

Modulul unui numar- valoarea absoluta a unui numar, definit astfel:

$|x|=\left \{ {{-x,x < 0} \atop {x,x\geq 0}} \right.$

|x|<k

-k<x<k

7.

a)

-√11≤x≤√11

x∈[-√11, √11], dar x∈Z

A={-3,-2,-1,0,1,2,3}

b)

-√21<x<√21

x∈N

B={0,1,2,3,4}

c)

-√17≤x≤√17

x∈Z

C={-4,-3,-2,-1,0,1,2,3,4}

d)

√2<|x|<√34

x∈N

D={2,3,4,5}

Un alt exercitiu gasesti aici: https://brainly.ro/tema/1623891

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