[" 9.If the roots of the quadratic equat...

[" 9.If the roots of the quadratic equation "],[x^(2)-4x-log_(3)a=0" are real,then the least "],[" value of "a" is "],[[" 1) "81," 2) "(1)/(81)," 3) "(1)/(64)," 4) "9]]

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