设A=
(11
1-1)
,B=____
(1-1
11)
,则B•A=_____.
设A=
(11
1-1)
,B=____
(1-1
11)
,则B•A=_____.
【正确答案】:(2 2 -2 -2) 分析:BA= (1 -1 -1 1) (1 1 -1 -1) = (2 2 -2 -2)
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