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[" 28.If "A=[[-1,(3)/(2)],[-(1)/(2),(1)/...

[" 28.If "A=[[-1,(3)/(2)],[-(1)/(2),(1)/(2)]]" ,then "I+A+A^(2)+..." is equal to "],[[" (a) "[[1,-3],[1,4]]," (b) "(2)/(7)[[1,-3],[-1,4]]]]

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