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9.已知函數(shù) f ( x) = (x2 – 3x + 2) g ( x ) + 3x – 4 , 其中g(shù) ( x )是定義域?yàn)镽的連續(xù)函數(shù),則方程f ( x) = 0在下面哪個范圍內(nèi)必有實(shí)數(shù)根 ( )
(A) ( 0, 1 ) (B) (1, 2 ) (C) ( 2 , 3 ) (D) ( 2, 4 )