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数学
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xy取何值时4x方+9Y方-4X+12y-1值最小
人气：326 ℃ 时间：2020-04-15 19:54:55
解答
4x方+9Y方-4X+12y-1
=(2x-1)^2 +(3y+2)^2-6
所以x=1/2 y=-3/2 值最小
为-6
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