X>0 Y>0.x+2y+2xy=8 .X+2Y的最小值是多少?

已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 2x+8y-xy=0(x>0,y>0),求x+y的最小值 已知正数x,y满足2x+8y-xy=0,x+y的最小值 x>0,y>o,x+2y+4xy=8,xy的最小值是多少 (x+y)^2/y^2-xy÷[-y^2+xy/(x-y)^2,x=0,y=根号10 已知x^2+4y^2-2x-2x+8y+5=0,求x^2-y^2/2x^2+xy-y^2*2y-y/xy-y/(x^2+y^2/y)^2的值 X>0 Y>0.x+2y+2xy=8 .X+2Y的最小值是多少? 已知x-2y=0,求(x/y-y/x)乘xy/x^2-2xy+y^2 若(x*x+y*y)(x*x+y*y)-4x*x*y*y=0,求代数式(x*x+5xy+y*y)/(x*x+2xy+y*y)的值 已知,x²+xy=14,y²+xy=2(x>y>0)求x+y.x-y 已知,x²+xy=14,y²+xy=2(x>y>0)求x+y.x-y 已知,x²+xy=14,y²+xy=2(x>y>0)求x+y.x-y [-xy^2(2x+y)-8xy)-x^2y)]除以2xy=计算 已知x-xy=8,xy-y=-9,求x+y-2xy的值 Y>0,2X+8Y-XY=0,求X+Y的最大值! 已知x+4y-2x+8y+5=0,求x^4-y^4/2x+xy-y·2x-y/xy-y÷(x+y/y)的值.数学上交不不算请教下. 已知X-XY-2Y=0求2X+3XY-Y/X-2XY+5Y 若x+y-5xy=0,求(2x-3xy+2y)/(x+2xy+y)的值