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[" a."2" .b."5" c.7"],[" 19.If "a,b,c" a...

[" a."2" .b."5" c.7"],[" 19.If "a,b,c" are three distinct positive real numbers,then the "],[" number of real roots of "ax^(2)+2blx|-c=0" is "],[[" a."0," b."4," c."2," d.none of these "]]

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