The decreasing interval of function y = x2-6x is () A. （-∞，2]B. [2，+∞）C. （-∞，3]D. [3，+∞）

The equation of symmetry axis of ∵ function y = x2-6x is x = 3, and the corresponding image is a parabola with the opening upward. As shown in the figure, the subtraction interval of ∵ function y = x2-6x is (- ∞, 3]

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