A. restaurant B. company C. library D. driver E. policeman F. policewoman
⑴ ____ ⑵ ____
⑶ ____ ⑷ ____
⑸ ____ ⑹ ____
已知a→、b→、c→均为单位向量,且满足a→•b→=0,则(a→+b→+c→)•(a→+c→)的最大值是( )
分解因式:(1)ax﹣ay;(2)x2﹣y4; (3)﹣x2+4xy﹣4y2.