M X Y0( , ) ( )0 0  C

3)

^{M x y}

⁰

^{( , ) ( )}

⁰

⁰

^

^C

. Tieỏp tuyeỏn cuỷa (C) taùi M caột 2 ủửụứng tieọm caọn taùo thaứnh moọt tam giaực

coự dieọn tớch khoõng phuù thuoọc M.

Phửụng trỡnh tieỏp tuyeỏn cuỷa (C) taùi M:

^{y f x x x}

^

^{'( )(}

⁰

^

⁰

⁾

^

^y

⁰

( -1)

-3 (

1

3

3

1

2

x

x

x









y

x

)

1 (

1)

(

1)

x

x

0

0

0













0

2

2

x

0

2







4

4









x

y

A

1

1,

0

0

 









1

1









Giao ủieồm vụựi tieọm caọn ủửựng x =1.

5

2

5

2







