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Sorin si-a redecorat camera si a asezat stelutele dupa o regula stabilita de el.Calculeaza suma numerelor de pe stelute,grupand convenabil termenii:1,2,3,4,5,9995,9996,9997,9998,9999,10000.

Răspuns :

(1+9999)+(2+9998)+(3+9997)+(4+9996)+(5+9995)+10000=
=10000+10000+10000+10000+10000+10000=60000
 Sper ca ti-am fost de ajutor!