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{12 [4 (3^3-18)-6]-120}+250 ; 1/3+3/3+...+2016/3

Răspuns :

{12 [4 (3³-18)-6]-120} +250=
= {12 [4•(27-18)-6]-120}+250 =
= [12 (108-18-6)-120]+250 =
= [12• (90-6)-120]+250 =
= (12• 84 - 120) + 250 =
= (1008-120)+250 =
= 888 + 250 =
= 1138

1/3+3/3+5/3+...+2017/3 =
= 1/3(1+3+5+...+2017) =
= 1/3[1+6:2+10:2+14:2+18:2+...+4034:2] =
= ...