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se da sirul de numere 5,10,15,20,...,1900 a) cati termeni are sirul b) calculați suma primilor 30 de termeni

Răspuns :

a)1900:5=360 temeni. b)5+15+20+25+30+35+40+45+50+55+60+65+70+75+80+85+90+95+100+105+110+115+120+125+130+135+140+145+150=2 325,,,,in 50 sunt 10 termeni