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?
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(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=
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f(x,y)={2-x-y,0
概率密度f(x,y )=2-x-y 0