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因為x2+y2=1 所以,-1≤x≤1 3x2+4y2-2x-5 =4(x^2+y^2)-x^2-2x-5 =4-(x+1)^2-4 =-(x+1)^2 x=-1時,有最大值=0 x=1時,有最小值=-4
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