若點(x,y)滿足x²;+y²;-6x-4y+12=0.則x/y的最大值和最小值分別是? x²;+y²;的最大值和最小值分別是?x+y的最大值和最小值分別是?
(x-3)^2+(y-2)^2=1 2
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