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6+12+18+24+____+354+360
Va rog urgen. Dau coroana . Repede.Va rog frumos repede....


Răspuns :

6 + 12 + 18 + 24 +...+ 354 + 360 =

= 6 × (1 + 2 + 3 + 4 +...+ 59 + 60) =

= 6 × 60 × (60+1) : 2 =

= 6 × 60 × 61 : 2 =

= 6 × 30 × 61 =

= 180 × 61 =

= 10 980
6+12+18+24+____+354+360=
=6(1+2+3+...+60)
=6*60*61:2
=10980