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Va rog ajutatima!

1+2+3+4+...1000+1234=


Răspuns :

1+2+...1000+1234=
1000x1001:2+1234=
500500+1234=501734
1+2+3+4+..................+1000+1234=
[1000x(1000+1):2]+1234=
(1000x1001:2)+1234=
(1.001.000:2)+1234=
500.500+1234=501.734