👤

A=(2+4+6+...+2016+2018+2020)-1010

Răspuns :

Răspuns:

A=(2+4+6+...+2016+2018+2020)-1010=

n(n+1)-1010=

2020(2020+1)-1010=1010(2×2020+2-1)=

1010×4041