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[" 11.If "2x^(3)+ax^(2)+bx+4=0" (a and b...

[" 11.If "2x^(3)+ax^(2)+bx+4=0" (a and b are positive real numbers) has three real roots,then "],[[" (A) "a>=4(2)^(1/3)," (B) "a>=(2)^(1/3)],[" (C) "a>=6(2)^(1/3)," (D) "a>=2(2)^(1/3)]]

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