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[" 13.If "A=[[2,1],[3,4]]," then "(adjA)...

[" 13.If "A=[[2,1],[3,4]]," then "(adjA)A=],[[" (a) "[[(1)/(5),0],[0,(1)/(5)]]," (b) "[[1,0],[0,1]]," (c) "[[5,0],[0,-5]]," (d) "[[5,0],[0,5]]]]

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