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Va rog!!!Am nevoie urgent!!!

Va RogAm Nevoie Urgent class=

Răspuns :

2x+1|21》2x+1apartine{1,3,7,21}
daca:
2x+1=1,x=0
2x+1=3,x=1
2x+1=7,x=3
2x+1=21,x=10
x apartine{0,1,3,10}