当Y=f(x)在[a,b}上递增时,Ymax=___,Ymin=___,当f(x)在{a,b}上递减时,Ymax=___,Ymin=___.已知函数f(x)=4X^2-mX+1,在(-∞,-2]上递减,在〔-2,+∞)上递增,则f(x)在〔1,2〕上的值域是___.当Y=f(x)在[a,b]上递增时,Y
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