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Calculati:a) 3+6+9+....+270
b)100 + 101+102+...+200


Răspuns :

a)3+6+9+18+270=
=9+9+18+270=
=18+18+270=
=36+270=
=336

100+101+102+303+200=
=201+102+303+200=
=303+303+200=
=606+200=
=806
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