已知(8x-9)^2+2|9y-8|=0,试求(2xy-x)/(3x-2y)+(xy-2)/(2y-3x)+(x-3)/(3x-2y)的值

已知x-y/x+y=y+z/2(y-z)=z+x/3(z-x),求证8x+9y+5z=0THX.. 已知x^2+y^2+6x-2y+10=0求8y/9x^2-y^2+4/y-3x 已知x²+y²+6x-2y+10=0,求8y分之9x²-y² + 4分之y-3x的值 已知x+7y+9=0,则3（8y-x)+3(2x-y-1)的值是多少? 已知X*X+Y*Y+6X-8Y+25=0 求（Y/X)+(X/Y)-2=? 已知x^2+4y^2-4x+8y+8=0,求x+y 已知x^2-6xy+9y^2=0,求(x-y)/(x+y) 已知(x+y)(x+y-6)+9=0求2(x+y)的值 已知:(x+y)(x+y+6)+9=0 求2(x+y)的值 已知(x+y)(x+y-2)-8=0,求x+y的值 已知|5x-y-8|+(7y-x+2)=0则4x+6y 已知（x+y）×（x+y+2）-8=0,求x+y的值 已知正数x,y满足2x+8y-xy=0,x+y的最小值 已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值 已知2^x = 8^y+1,9^y = 3^x-9 ,1/3x+1/2y = 已知{2}^{x}={8}^{y=1},{9}^{-y}={3}^{x-8},求{x}^{y}的值 已知2x-3y=-4,求4x^2+8x+12y-9y^2的值 已知x^2+y^2-6x-8y+25=0,求分式y/x - x/y的值