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1.下列二次三项式是完全平方式的是(  )
A: x2-8x-16
B: x2+8x+16
C: x2-4x-16
D: x2+4x+16
  • 提示1IOagueaNruWujOWFqOW5s+aWueWFrOW8j++8mu+8iGHCsWLvvIk8c3VwPjI8L3N1cD49YTxzdXA+Mjwvc3VwPsKxMmFiK2I8c3VwPjI8L3N1cD7vvIzlr7nlkITpgInpobnliIbmnpDliKTmlq3lkI7liKnnlKjmjpLpmaTms5XmsYLop6Mu