圆 x^2+y^2-2x-2y+1=0的切线l交x y轴于点A B,|OA|=a|OB|=b(a>2,b>2)三问,证明(a-2)(b-2)=2,求AB的中点的轨迹,三角形AOB面积的最小值

x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 已知x+y=a,2x-y=-2a,求[（x/y-y/x)/(x+y)-x(1/x-1/y)]/[(x+1)/y]的值 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 若|x+y-1|+（x-y-2)²=0,求代数式（x+2y)(x-2y）-（2x-y)(-y-2x)的值. 若x*x+y*y=x+y-1/2,求x,y的值如题 已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值? 已知2x-y=0,求分式【1+（3*y*y*y/x*x*x-y*y*y）】/【1+（2y/x-y）】的值注：x*x*x-y*y*y=（x-y）*（x*x+xy+y*y） 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 x*x+2x-y*y+6y-8=0,x+y不等于2,求x-y的值 x(x-y)-y(y-x)+(x-y)的二次方其中x=-1y=2 先化简再求值 x(x-y)-y(y-x)+(x-y)的平方,其中x=-1,y=2 先化简再求值x(x-y)-y(y-x)+(x-y)的平方,其中x=-1,y=2 先化简再求值 x(9x-y)-y(y-x)+(x-y)的平方,其中x=-1,y=2 如果|x-y+1|+y^2-4y+4=0,求出x,y的值 设x大于1,y大于0,x^y+x^-y=2根号二,x^y-x^-y等于? 已知x-y=1,求[(x+2y)^2+(2x+y)(x-4y)-3(x+y)(x-y)]除以y的值大神们帮帮忙 圆x^2+y^2=1,求点[(x(x+y),y(x+y)]的轨迹方程 已知x-y=1,求[(x+2y)²+(2x+y)(x-4y)-3(x+y)(x-y)]÷y的值