Question

4) Calculati numerele :
a) 3+6+9+...+2001=
b)4+8+12...+2000=
​

Answer 1

Răspuns:

a)3+6+9+...+2001=

=2001×(2001+1):2=

=2001×2002:2=

=4.006.002:2=

=2.003.001

b)4+8+12...+2000=

=2000×(2000+1):2=

=2000×2001:2=

=4.002.000:2=

=2.001.000

Explicație pas cu pas:

,,,,,,☆succes!