Question

20-x mai mare sau egal decât 13

Answer 1

20-x=13    x=20-13  x=7    x={8 7 6 5 4 3 2 1 }

Answer 2

[tex]20-x\geq13\  \Longrightarrow 20\geq13+x \Longrightarrow x+13 \leq 20 \Longrightarrow x\leq 20-13 \Longrightarrow x\leq7[/tex]


$Daca \ x \ este\ numar\ natural,\ atunci \ x\in\{1,2,3,4,5,6,7\}$