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[" 7.If the matrix "[[a+b,0,0],[0,b+c,0]...

[" 7.If the matrix "[[a+b,0,0],[0,b+c,0],[0,0,c+a]]" ,(where "a,b," care "],[" positive integers) is a scalar matrix,then the value "],[" of "(a+b+c)" can be "],[[" (a) "6," (b) "8],[" (c) "5," (d) "7]]

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