2x+8y-xy=0 2x+8y=xy 2/y + 8/x=1 x+y =2x+8y-xy=02x+8y=xy2/y + 8/x=1x+y=(x+y)*1=(x+y)(2/y + 8/x)=8+2+ 2x/y +8y/x≥10+2√[(2x/y)(8y/x)]=10+2√16=18最小值为18没看懂的地方=8+2+ 2x/y +8y/x≥10+2√[(2x/y)(8y/x)]=10+2√16=18 2x/y +8y/x怎

[-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 x>0,y>o,x+2y+4xy=8,xy的最小值是多少 已知xy/x+y=2,求代数式8x-5xy+8y/-x+3xy-y的值 诺x+y=6,xy=4 求(5x-4y-3xy)-(8x-y+2xy) 方程组,x平方-xy+2x=0,x平方-2xy+y+8=0, 若（x+1)^2+|y-2|=0,求3x^2-[5xy-(x^2y-3xy)+4x^2y-8xy]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 已知x>0y>0切2x+8y-xy=0求xy的最小值和x+最小值y已知x>0y>0切2x+8y-xy=0求xy的最小值 已知xy/x+y=2,则代数式3x-5y+8y/-x+3xy-y的值 x^2-xy=2,y^2-xy=8,x^2-y^2 （12x^2y-8xy^2+16xy）/-3x+2y-4=? (12x^2y-8xy^2+16xy）/-3x+2y-4=? x+y=8,xy=-2,求(5xy+4x+7y)+(6x-3xy)-(4xy-3y)的值 |x|/x+y/|y|+xy/|xy|= 已知2x+xy=10,3y+2xy=6.求4x+8xy+9y=? 已知x^+xy=-5,xy+y^=8,求2x^-xy-3y^的值都是2次