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A={x apartine N / 2x+1 ≤ 51} Va rog

Răspuns :

2x+1 ≤ 51
2x ≤ 51-1
2x≤50
x≤25
x={1,2,3,4,...,22,23,24,25}
A={1,2,...,24,25}
2x=51-1
2x=50
x=50:2
x=25
x apartine ( 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25)