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Determina numarul natural n care verifica egalitatea a) n(n+1) = 156 b)(n -1 ) × n = 110

Răspuns :

n(n+1) = 156
156=2
²×3×13 =12×13=12×(12+1)
n=12

b)(n -1 ) × n = 110
110=2
×5×11=10×11=(11-1)×11
n=11