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Urgent!!!! Aratati ca a=2·(1+2+4+....+224)_224 esre patrat perfect si apoi calculati radicsl din a

Răspuns :

a=2×(1+2+4+....+224)-224=
=2×224×225/2-224=
=224×225-224=
=224
×(225-1)=
=224×224=
=224²
√a=√224²=224