实数x,y满足..x+y=3a-1和x^2+y^2=16-2a+2...,求x y的最小值与最大值.
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实数x,y满足..x+y=3a-1和x^2+y^2=16-2a+2...,求x y的最小值与最大值.
实数x,y满足..x+y=3a-1和x^2+y^2=16-2a+2...,求x y的最小值与最大值.
实数x,y满足..x+y=3a-1和x^2+y^2=16-2a+2...,求x y的最小值与最大值.
xy = (x+y)²-(x^2+y^2)=(3a-1)²-(16-2a+2) = 9a²-4a-17= 9(a - 2/9)² -17(7/9)
故:x y的最小值-17(7/9)即:负十七又九分之七,无最大值.
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