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a=(1/2-√3)la2+(√3/2+1) la 2 +(1-√5)*(1+√5) este intreg

Răspuns :

(1/2)la2-2*1/2*radical3-(radical3)la2+(radical3/2)la2+2*radical3/2*1+1la2+1*1+1*radical5-1*radical5-(radical5)la2=1/4-radical3-9+3/4+radical3+1+1-5=-11