函數(shù)yx2-5ax+6a2(aR為常數(shù))……?(    )?

A.在[a,+∞上為增函數(shù)?

B.(-∞, a]上為增函數(shù)?

C.在[2a,3a]上為增函數(shù)?

D.在(-∞,3a上為減函數(shù)?

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科目:高中數(shù)學 來源:數(shù)學教研室 題型:013

函數(shù)yx2-5ax+6a2(aR為常數(shù))……?(    )?

A.在[a,+∞上為增函數(shù)?

B.(-∞, a]上為增函數(shù)?

C.在[2a,3a]上為增函數(shù)?

D.在(-∞,3a上為減函數(shù)?

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