Răspuns :
[tex]5^{2} *6+5^{2} *9+5^{2} *10=\\= 25*6+ 25*9+25*10=\\=150+225+250=\\=625[/tex]
Este patrat perfect deoarece [tex]25^{2} =625[/tex]
Salutare!
5²×6+5²×9+5²×10=
25×6+25×9+25×10=
150+25×9+25×10=
150+225+25×10=
150+225+250=
375+250=
625
625=25² pătrat perfect
#Succes!