函数y=()x2-3x+2在下列哪个区间上是增函数( )A.(-∞,]  B.[,

函数y()x23x2在下列哪个区间上是增函数(  )

A(]  B[,+∞)

C[1,2]         D(,-1][2,+∞)

答案

 A

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