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Răspuns :

Răspuns:

(√3+√5-√7)²-2(√15-√21-√35)=

(√3)²+(√5)²+(√7)²+2·√3·√5-2·√3·√7-2·√5·√7-2√15+2√21+2√35=

3+5+7+2√15-2√21-2√35-2√15+2√21+2√35=3+5+7=15∈N

Explicație pas cu pas: