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[" 90.If the function "f(x)=x^(2)-kx+5" ...

[" 90.If the function "f(x)=x^(2)-kx+5" is increasing "],[" on "|2,4]" ,then "],[[" (a) "k in(2,oo)," (b) "k in(-oo,2)],[" (c) "k in(4,oo)," (d) "k in(-oo,4)]]

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