x>0,y>0,且x+yxy
已知|3-y|+|x+y|=0,求x+yxy
已知x/5=y/3,则(x/x+y)+(y/x-y)-(yxy/xxx-yxy)
若正数x,y满足2x+y-3=0,则x+2yxy的最小值为( )
X+y=4,Xy=-12 求(1)XxX+yxy (2)XxXxy+Xxyxy
已知x和y满足2x+3y=5,则当x=4时,代数式3(xXx)+12xy+(yXy)的值是( )
设x、y、z?[0,1],且|x-y|
x>1,y>0,且满足xy=x^y,x/y=x^3y,求x+y
在分式2x+3yxy中,x、y的值都扩大到原来的2倍,则分式的值( )
f(x+y)=f(x)f(y)且,x>0,f(x)属于(0,1)
如果分式3x-6y/x+y=0,那么x,y 应满足 A、x=2y B、x≠-y C、x=2y且x≠-y D、x=2y且y
x>0y>0且1/x+9/y=1求2x+y最小值
{(x,y)I x+y-3=0且x-y-1=0}