👤

si b)1/21+2/21+3/21+....+20/21​

Si B1212213212021 class=

Răspuns :

acolo e 23, nu 21

1/23+2/23+3/23+...+22/23=

1+2+3+...+22/23=

23×22÷2/23=

23×11/23^(23 adica: simplificat cu 23
11/1=11