... Bài 11: ( )min23654→++= xxxxf =≥=+−+−=−+−=+−+6 ,1 ,022322428754654365426541jxxxxxxxxxxxxxj Bài 12: ( )min221→+= xxxg=≥=+−=−=−+5 ... )min221→+= xxxg=≥=+−=−=−+5 ,1 ,0 -32x2x-x4 -x2543542541jxxxxxxj Bài 13: ( )min23621→−+= xxxxf=≥=−++=−+−−=+−+6 ,1 ,081031xx5734654365426541jxxxxxxxxxxxj...