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rezolvati in multimea numerelor inecuatia 3 la puterea x+1mai mic sau egal cu 81

Răspuns :

3la puterea2=3x3=9+1=10
3la puterea 3=3x3x3=27+1=28
3la puterea 4=3x3x3x3=81+1=82

3la3+1=27+1=28  <sau=cu 81

3la puterea 1=3+1=4<81
3la 2=9=9+1=10<81
3la3=27+1=28<81
x∈{1,2,3}