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1+3+5+.....+2003-2-4-6-.....-2002=

Răspuns :

1+3+5+.....+2003-2-4-6-.....-2002=

= 1 + ( 3 - 2) + ( 5 - 4 ) + ( 7 - 6) +.......+ ( 2 003 - 2 002) = 

= 1 + 1 + 1 + 1 + .....................+ 1 = 

= ( 2 003 - 1) : 2 + 1 =  

= 2002 : 2 + 1 =

= 1001 + 1 = 

= 1 002