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Hyze
a fost răspuns

aratati ca nr a=(3^21 + 3^20 +3^19):39 este patrat perfect

Aratati Ca Nr A321 320 31939 Este Patrat Perfect class=

Răspuns :

Lucasela

(3^21 + 3^20 +3^19):39=3^19(3^2+3+1):39

                                      =3^19 x 13 :39

                                      =3^18 x 3 x 13 :39

                                      =(3^9)^2 x 39:39

                                      =(3^9)^2  p.p.





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