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Higher level maths

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x,y,z are 3 real number such that x+y+z=5 and xy+yz+zx=3.Find the maximum of x. 更新: micatkie: Do you mean x = √19,then y=0,z=0?I think you are wrong....

最佳解答:

﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣﹣ 圖片參考：http://imgcld.yimg.com/8/n/HA05107138/o/20131122112648.jpg

其他解答:

Dear ALL, Do you know what's wrong with this solution? http://i.imgur.com/LIRKYmn.png ^__^" 2013-11-22 22:34:19 補充： 哈哈! Bravo~ 這樣就準確無誤啦~ ☆ヾ(???)ノ|||||If x = √19, y=0 and z=0 It does not satisfy with the two given equations x+y+z=5 and xy+yz+zx=3|||||Answer. maximum of x= 13/3 2013-11-20 23:30:51 補充： when x=3/13, y=1/3, z=1/3 2013-11-20 23:31:27 補充： when x=13/3, y=1/3, z=1/3.