x^2+y^2+2x-6y+F=0与x+2y-5=0交A.B两点.O为原点,OA垂直OB,求F值?

(X,Y) f(x,y)={12y^2,0 y=e^x y'=e^x 可以写成 y=f(x)与导数y=f'(x) y=x^2 y=2x 写成y=f(x)与导数y=f'(x) 圆x^2+y^2-4x-6y+F=0与y轴相切,则F= f(x+y,x-y)=(x^2-y^2)/2xy,求f(x,y)! 设f(x+y,x-y)=x^2-y^2,则f(x,y)= 若f(x+y,y/x)=x^2-y^2,则F(X,Y)= 已知f(x+y,y/x)=x^2-y^2,则f(x,y)= f(x+y,y/x)=x^2-y^2求f(x,y) f(x+y,y/x)=x^2-y^2,求f(x,y),详见里面 f(x+y,x-y)=2xy(x-y),求f(x,y) f(x+y)=f(x)+f(y)+2xy f(xy,x-y)=x^2+y^2+xy;f(x,y)/∂x;f(x,y)/∂y y=f(-x+2)与y=f(x-2)关于y轴对称为什么不对? 已知f(0)=1,f(x-y)=f(x)-y(2x-y+1),求f(x) 函数f(x,y)=xy/x*2 y*2,求limf(x,y)与limf(x,y) 求f(x,y)=x+y+7的最大值,使(x,y)满足x+2y≤10,2x+y≥6,y≥0 f(x,y)={2-x-y,0 概率密度f(x,y )=2-x-y 0