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Amaliateodora2003
a fost răspuns

daca n egal 1999 plus 2 ori {1 plus 2plus ..... plus 1998} n este egal cu?

Răspuns :

OiLoveYouO
n=1999+2×(1+2+3+4+...+1998)
[tex] n=1999+2 \frac{1998*1999}{2} [/tex]
n=1999+1998×1999
n=1999(1998+1)
n=1999×1999
n=1999²
1+2+++1998=
1998x1999:=1997001
n=1999+2x1997001
n=1999+3994002
n=3996001