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17 va rogggggggg repede dau coroana!!!!!!!!!!

17 Va Rogggggggg Repede Dau Coroana class=

Răspuns :

1/4 + 5/4 + 9/4 + ........... + 401/4=(1+5+9+....+401)/4=
((1+401)*101/2)/4=402*101/2/4=20301/4