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12. The real values of a for which ...
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12. The real values of a for which the equation x-3x°-9x+2=0 has three distinct real roots, if 2 € (A)(-2,0) (C)[1,2] (B)[0,1] (D) (-0, 0)
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( xi omega^{*} vec{x} ) 酉 63 8 -32 -2 ( 8 % )
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