👤

27-25+23-21+.....+7-5+3-1
Rezolvare explicita va rog


Răspuns :

27-25+23-21+...+7-5+3-1 =

= (27-25)+(23-21)+...+(7-5)+(3-1)

= 2+2+...+2+2 {de (27+1)/4 = 7 ori}

= 2·7

= 14