va rog !!!
am nevoie urgent acum!!!
dau coroana !!

Răspuns:
(1+64)*64/2=65*32=2080 ; b) (2+102)*52/2=104*26= 2704 ; c) (5+250)*50/2=255*25=6375 ; d) 3x-2=235 ; 3x=237; x=179 ; termeni ;
Explicație pas cu pas:
(1+235)*179/2=21112