设函数f (x)=x3-4x+a,0<a<2.若f (x)的三个零点为x1,x2,x3,且x1<x2<x3,则
A.x1>-1 | B.x2<0 | C.x2>0 | D.x3>2 |
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设函数f (x)=x3-4x+a,0<a<2.若f (x)的三个零点为x1,x2,x3,且x1<x2<x3,则
A.x1>-1 | B.x2<0 | C.x2>0 | D.x3>2 |
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