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efectuati (3-2√5)totul la patrat

Răspuns :

[tex](3-2 \sqrt{5})^2=\ \textgreater \ 3^2-2*3*2 \sqrt{5}+(2 \sqrt{5})^2\\ ~~~~~~~~~~~~~~~=\ \textgreater \ 9-12 \sqrt{5} +20\\ ~~~~~~~~~~~~~~~=\ \textgreater \ 29-12 \sqrt{5}[/tex]