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1+2+3+4...............+1999+2000

Răspuns :

(2000 * 2001)/2=4002000/2=2001000

2000+
1999+1=2000+
1998+2=2000+
...........................+
............................+
.............................+
1002+998=2000+
1001+999=2000+
1000=
2000×1000+1000=
2000000+1000=
2001000