- 搜標(biāo)題
- 搜題干
- 搜選項(xiàng)
單項(xiàng)選擇題
已知A，B均為n階方陣，則必有______．
(A)(A-B)2=A2-2AB+B2(B)(AB)T=BTAT
(C)AB=O時(shí)，A=O或B=O??(D)A2-B2=(A-B)(A+B)
(C)AB=O時(shí)，A=O或B=O??(D)A2-B2=(A-B)(A+B)
