Răspuns:
110+120+130+140+150+160=
=(140+160)+(150+120+130)+110
=300+300+110
=710
1400+1500+1600+1700+1800+1900=
=(1400+1600)+(1500+1700+1800)+1900=3000+5000+1900=
=8000+1900=
=9900
210.000+220.000+230.000+240.000+
250.000+260.000=
=(240.000+260.000)+(250.000+220.000+230.000)+210.000=
=500.000+700.000+210.000=
=1.200.000+210.000=
=1.410.000
Sper ca e bun !! Mi-a luat bun!!
Mult spor!!
