若x^2+9y^2-2x+12y+5=0,试求y^2的值

已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值 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-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 若3x-5y=0,则x+y/x=（）,x-y/y=（）,2x-3y/2x+3y=( ) (X,Y) f(x,y)={12y^2,0 4(x-y)-3(x-y)=9 5(x-y)+2(x-y)=11 x*x+2x+y*y-4y+5=0 x= y= 若x^2+9y^2-2x+12y+5=0,求x+y^2 若4x^2-4x+9y^2-12y+5=0,求（x-3y）^2-(x+3y)^2 (5)若x/2=y/3(y不为0）则x/y=____,x+y/y=___,y/x-y=___. 已知x*x+4x+y*y-2y+5=0,则x*x+y*y=? 若2x-5y=0,则y：x 若x>0,y>0,且√x(√x+√y)=3√y(√x+5√y),求2x+2√x*√y+3y/x-√x*√y+y 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) 若|x+y-3|+(x-y-5)^2=0,则x)^2-y^2= 求x ,y 9x^2+4y^2-12x-8y+8=0 9(x-y)-12(y-x)^2 若2x-3y=0,求5x+4y/3x-2y