已知x,y满足x的平方加y的平方加5分之4,求xy分之x+y
展开全部
x方+y方+5/4=2x+y
(x方-2x+1)+(y方-y+1/4)=0
(x-1)方+(y-1/2)方=0
x=1,y=1/2
xy/(x+y)=1/3
(x方-2x+1)+(y方-y+1/4)=0
(x-1)方+(y-1/2)方=0
x=1,y=1/2
xy/(x+y)=1/3
参考资料: http://zhidao.baidu.com/question/10525575.html?fr=qrl3
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