Find the max. and min. value of (8xy+12yz-8y²+z²+u²)/(x²-2xy+5y²+z²+9u²)
where x,y,z,u are any real numbers and (x,y,z,u)≠(0,0,0,0).
求(8xy+12yz-8y²+z²+u²)/(x²-2xy+5y²+z²+9u²)的最大小值,其中(x,y,z,u)≠(0,0,0,0)
Max. and Min.(2)
2011-11-29 7:50 am
回答 (1)
2011-11-30 7:20 am
收錄日期: 2021-04-24 10:08:16
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