∵1/2|a-b|+√﹙2b+c﹚+(c-1/2﹚²=0且1/2|a-b|≥0,√﹙2b+c﹚≥0,(c-1/2﹚²≥0∴1/2|a-b|=0,√﹙2b+c﹚=0,(c-1/2﹚²=0∴a=b,2b+c=0,c=1/2∴a=b=-1/4,c=1/2∴a(b+c)=-1/16
0+0型 c=1/2 b=-1/4 a=-1/4答案是-1/16