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2014-10-22T21:42:46+03:00
(1+2+3+...+2014)/2015=
2015*2014/2/2015=
2015*1007/2015=1007
2 5 2
2014-10-22T21:44:50+03:00
(2014·2015÷2)÷2015=(1007·2015)÷2015=1007
3 3 3