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(√3+√5)^2 - (√3-√5)^2

Ajutor!


Răspuns :

Folosesti formulele
(a+b)^2=a^2+2ab+b^2
(a-b)^2=a^2-2ab+b^2

(√3)^2+2×√3×√5+(√5)^2-((√3)^2-2×√3×√5+(√5)^2)=3+2√15+5-3+2√15-5=4√15