设X/3=Y/2=Z/5=k
则x=3k,y=2k,z=5k
xy+xz+yz/x^2+y^2+z^2
=(6k^2+15k^2+10k^2)/(9k^2+4k^2+25k^2)
=(6+15+10)/(9+4+25)
=31/38
X/3=Y/2=Z/5,则分式xy+xz+yz/x^2+y^2+z^2=
X/3=Y/2=Z/5,则分式xy+xz+yz/x^2+y^2+z^2=
数学人气:637 ℃时间:2020-01-27 22:22:53
优质解答
我来回答
类似推荐
猜你喜欢
- 1一袋大米重12千克,若用去几分之几,还剩4千克,若用去()千克,还剩下3分之1.
- 2一个化学反应方程式的意义
- 3问:My family_____ all at home.选项:A.am B.is C.are D.be
- 4playing lt's students too because football in hot don't summer like造句
- 5数学题、关于利润、打折
- 6My grandfather often _______ in the evening
- 7散步句子赏析(5句)(每个100字)
- 8如图,△ABC中∠ABC的平分线与∠ACB的外角∠ACD的平分线交于一点E
- 980吨比( )吨多三分之一;( )厘米比30厘米少三分之一
- 10写一句有关生命的格言