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scrieți nr 5/\4 ca suma de 4 patrate perfecte.

Răspuns :

5^4=5×5×5²=(1+4)(1+4)×5²=(1+4+4+16)×5²=(1+2²+2²+4²)×5²=
=5²+(2×5)²+(2×5)²+(4×5)²=
=5²+10²+10²+20²


verificare
5^4=625=25+100+100+400