udowodnij że 1-2+3-4+5-6+7-8+...+1997-1998+1999-2000=-1000
1-2+3-4+5-6+7-8= 36
+
(1997- 1998) = -1
(1999-2000) = -1
= -1000
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1-2+3-4+5-6+7-8= 36
+
(1997- 1998) = -1
+
(1999-2000) = -1
= -1000