|x-4y|+(2y-10)^2=0,则以2为底y/x的对数=___

已知x*x+4x+y*y-2y+5=0,则x*x+y*y=? x^2+4y^2-6x+4y+10=0,求x^4-y^4/(x+2y)(x-2y)*x+2y/xy^2+y^3除以（x^2+y^2/y)^2的值 若x-y不等于0,2x-3y=0,则分式(10x-11y)/(x-y)的值是（）?(10x-11y)/(x-y) =[(8x-8y)+(2x-3y)]/(x-y) =8为什么8X-8Y=8？(10x-11y)/(x-y)=[(8x-8y)+(2x-3y)]/(x-y)=8+(2x-3y)]/(x-y)=8+0=8 {4x-3y-10=0 3x-2y=0,{3x-4(x-y)=2 2x-3y=1,{2(x+y)-(x-y)=3 (x+y)-2(x-y)=1 x*x+2x+y*y-4y+5=0 x= y= 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 已知x-y-3绝对值+(2x+2y+10)的平方=0,则(x+y)(x-Y)= 已知：4x^2+y^2-4x-6y+10=0,求y/x-x/y的值 x^2+y^2-2x+4y-20=0则y/x的最大值,x+y的最大值 设实数x,y 满足x²+4y²+2x-4y+2+0 则x+y= 如果有理数x.y满足x^2+y^2+4x-6y+13=0,则y^x=? x^2+6x+y^2+4x+10=0,则x+y等于多少? 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 若x^2+2x+y^2-6y+10=0,则x-y 已知3x-4y=0,则x^2-y^2/x^2+y^2 已知x^2+y^2-4x+2y+5=0则x^y=? 已知x^2+4x+y^2+2y+5=0,则x^y= 若x^2+y^2-10x+6y+34=0,则x+y=?