(C) CÚ TÕM O(0;0) BỎN KỚNH R = 1 VỠ D TI P XỲC V I (C) Ế Ớ ￬ D(O;D) ...
1,0
Ta cú: (C) cú tõm O(0;0) bỏn kớnh R = 1
Vỡ d ti p xỳc v i (C)
ế
ớ
￬
d(O;d) = R
2
1
2
a
+
b
=1
�
a
2
+
b
2
=
1
�
a
2
+
b
2
=
1
1,0
Ta cú: (C) cú tõm O(0;0) bỏn kớnh R = 1
Vỡ d ti p xỳc v i (C)
ế
ớ
￬
d(O;d) = R
2
1
2
a
+
b
=1
�
a
2
+
b
2
=
1
�
a
2
+
b
2
=
1