Question

b) 2. (1+2+3+...+2019): 2 020.​

Answer 1

Răspuns:

1+2+3+...+2019=

2019×(2019+1):2=

2019×2020:2=

4.078.380:2=

2.039.190:2020=

1009,5

sper sa fie bine

Answer 2

Răspuns: 2019

Explicație pas cu pas:

$\bf 2\cdot (1+2+3+...+2019): 2 020=$

$\bf 2\cdot [(1+2019)\cdot 2019:2]: 2 020=$

$\bf 2\cdot [2020\cdot 2019:2]: 2 020=$

$\bf 2\cdot 2020\cdot 2019:2: 2 020=$

$\boxed{~\bf 2019~}$