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Aratati ca :
log2([tex] \sqrt{7} + \sqrt{3} [/tex]) + log2([tex] \sqrt{7} } - \sqrt{3} [/tex])=2


Răspuns :

log2[(√7+√3)*(√7-√3)]=2
log2(√7²-√3²)=2
log2(7-3)=2
log2(4)=2
2=2 (A)