- 1 -
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姝ゅ棰樹负
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鐗堬紝
璇锋寜浣?/p>
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,
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鏂囨。杩斿洖鍘熸澘鍧椼�?/p>
璇炬椂鎻愬崌浣滀笟
(
浜屽崄鍏?/p>
)
鐩寸嚎涓庡渾鐨勬柟绋嬬殑搴旂敤
(25
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60
鍒?/p>
)
涓�銆侀�夋嫨棰?/p>
(
姣忓皬棰?/p>
5
鍒?/p>
,
鍏?/p>
25
鍒?/p>
)
1.
鍦?/p>
x
2
+y
2
-4x+2y+c=0,
涓庣洿绾?/p>
3x-4y=0
鐩镐氦浜?/p>
A,B
涓ょ偣
,
鍦嗗績涓?/p>
P,
鑻モ垹
APB=90
掳
,
鍒?/p>
c
鐨勫�间负
(
)
A.8
B.2
C.-3
D.3
銆愯В鏋愩�?/p>
閫?/p>
C.
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C<5,
鍦嗗績
P(2,-1),r=
,
鍦嗗績鍒扮洿绾跨殑璺濈
d=
=2,
鐢变簬鈭?/p>
APB=90
掳
,
鎵�浠?/p>
r=
d=2
,
浠庤�?
=2
,c=-3.
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鑻?/p>
P(2,-1)
涓哄渾
(x-1)
2
+y
2
=25
鐨勫鸡
AB
鐨勪腑鐐?/p>
,
鍒欑洿绾?/p>
AB
鐨勬柟绋嬫槸
(
)
A.x-y-3=0
B.2x+y-3=0
C.x+y-1=0
D.2x-y-5=0
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閫?/p>
A.
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O(1,0),
鏍规嵁棰樻剰
:
鍙?/p>
k
AB
路
k
OP
=-1,
鎵�浠?/p>
k
AB
=1,
鏁呯洿绾?/p>
AB
鐨勬柟绋嬫槸
x-y-3=0.
2.
濡傛灉瀹炴暟
x,y
婊¤冻绛夊紡
(x-1)
2
+y
2
=
,
閭ｄ箞
鐨勬渶澶у�兼槸
(
)
A.
B.
C.
D.
銆愯В鏋愩�?/p>
閫?/p>
D.
鐨勫嚑浣曟剰涔夋槸鍦嗕笂鐨勭偣
P(x,y)
涓庡師鐐硅繛绾跨殑鏂滅巼
,
缁撳悎鍥惧舰寰?/p>
,
鏂滅巼鐨勬渶澶у�间负
,
鎵�浠?/p>
=