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[tex] (\sqrt{7} +4 \sqrt{3} + \sqrt{7} -4 \sqrt{3} )^2[/tex]

Răspuns :

(√7 + 4√3 + √7 - 4√3)² = ( 2√7)² = 2²·√7² = 4 ·√49 = 4·7 = 28