x>0,y>0.xy=200,则2x+y的最()值是()

x>0,y>0.xy=200,则2x+y的最()值是() {x,xy,lg(xy)}={0,|x|,y} 则log8（X^2+Y^2） x*x+xy=3,xy+y*y=2,则x*x+2xy+y*y=________? 已知x^2-3xy+2y^2=0 则x/y+x/y= 若实数x,y满足x^2-xy-y^2 =0,则x/y=? 已知x+y=1,x>0,y>0,则2x+y/xy等于 已知正整数x,y满足：xy-x-y=0,则x+2y的最小值 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 若|x-3|+（y+2）=0,则（x-y+4xy/x-y）（x+y-4xy/x+y）的值是 若|x-3|+（y+2）²=0,则（x-y+4xy/x-y）（x+y-4xy/x+y）的值是 函数f(xy,x+y)=x^2+xy+y^2,则df(x,y)=? f(xy,x-y)=x^2+3xy+y^2,则f(x,y)=? 若x+y=1,x不等于0则x+(2xy+y^2)/x/(x+y)/x= 当实数x,y满足xy+x+y+7=0,3x+3y=9+2xy,则x平方y+xy平方=多少 |x-2|+|y-2|=0,求xy=?；|x|=-|y-7|,则xy=? 如果x+y=0,xy=-7,则x^2y+xy^2=? 已知x^2-3xy+2y^2=0(xy≠0),则x/y+y/x= 若y-2x=0,则分式(x^2+xy+y^2)/(x^2-xy+2y^2)=