👤
Pepsicola00
a fost răspuns

5+10+15+...+95 =
5+8+11+...+305=
Sunt doua exercitii si ultimele

Răspuns :

5+10+15+...+95 =
5(1+2+3...19) = 
5·19·20:2 = 950

5+8+11+...+305 =
5(1+2+3+...+61) =
5·61·62:2 = 9455
Nicutlita
5+10+15+20+25+30+35+40+45+50+55+60+65+70+75+80+85+90+95=950
5+8+11+14+17+20+23+26+29+32+35+38+41+44+47+50+53+56+59+62+65+68+71+74+77+...=??

Alte intrebari