2 . , -
Ax2+Cy2=d,
, .. *<0
) d>0, -
: x2/a2-y2/b2=1, F1(c,o) F2(-c,0)
, e>0, e=c/a - .
-:
= 2.
) d=0, - x2/a2-y2/b2=0,
2
//b=0
) d<0, x2/a2-y2/b2=-1 - -
.
2 .
- 2 .
- Ax2+Bxy+Cy2+Dx+ey+F=0,
A,B,C,D,e,F -
,
- 2 . 2 .
/
-. . - -
.
) :
y=f(Un), U1,U2,...Un, Un=n/(n2+1)
:
xn, +
e()
N,
n>N |xn-a|<e
limxn=a
n¥
-e<Xn-a<e
a-e<Xn<a+e
) -:
y=f(x)
, /
... |x-a|0, |x-a|<e
- f(x)
, ,
e. -e>0,
d>0, :
|x-a|<d, |f(x)-A|<e
-:
1. , 1.
2. limC=C, -
3. a-..., lima=0
4. ...
5. limy=a, y=a+a, a-...