Question

!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!​

Answer 1

Răspuns:

a) x apartine {6,7,8, ... , 20}

b) x=2 fals

x=4 fals

x=5 fals

x=11 adevarat

x=25 fals

x=30 fals

Explicație pas cu pas:

a)x+4<25 |-4

=> x<21 => x apartine {0,1,2,3,4,5, ... ,20}

2x>10 | :2

=> x>5 => x apartine {6,7,8, ... , 20}

b) cazul 1 => x=2

=> x<21 => 2<21 Adevarat

=> x>5 => 2>5 Fals =>> FALS

cazul 2=> x=4

=> x<21 => 4<21 Adevarat

=> x>5 => 4>5 Fals =>> FALS

cazul 3 => x=5

=> x<21 => 5<21 Adevarat

=> x>5 => 5>5 Fals=>> FALS

cazul 4 => x=11

=> x<21=> 11<21 Adevarat

=> x>5=> 11>5 Adevarat=>> ADEVARAT

cazul 5 => x=25

=> x<21 => 25<21 Fals

=>> FALS

cazul 6 => x=30

=> x<21 => 30<21 Fals

=>> FALS