Question

cum se rezolva exercitiul:10+20+30+...+1230 dau multe pct + coroana

Answer 1

10+20+30+...+1230=10•1+10•2+10•3+...+10•123=10(1+2+3+4+...123)=10•(123•124/2)=10(123•62)=10•7626=76260

Answer 2

S=10+20+30+.....+1230
S=10*(1+2+3+....+123)
S=10*(123*124:2)
S=10*(123*62)
S=10*7626
S=76260