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20-x mai mare sau egal decât 13

Răspuns :

20-x=13    x=20-13  x=7    x={8 7 6 5 4 3 2 1 }
[tex]20-x\geq13\  \Longrightarrow 20\geq13+x \Longrightarrow x+13 \leq 20 \Longrightarrow x\leq 20-13 \Longrightarrow x\leq7[/tex]


[tex]Daca \ x \ este\ numar\ natural,\ atunci \ x\in\{1,2,3,4,5,6,7\}[/tex]