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Offf....................

Offf class=

Răspuns :

8-2*√15=5-2√15+3=√5²-2*√5*√3+√3²=(√5-√3)²
8+2√15=5+2√15+√3=...(√5+3)²
N1=√(√5-√3)²+√(5+√3)=√5-√3+√5+√3=2√5
N=N1/(N-2√5)