绗簩鑺?/p>
鍙傛暟鏂圭▼
[
鍩虹杈炬爣
]
涓�銆佸～绌洪
(
姣忓皬棰?/p>
5
鍒?/p>
,
鍏?/p>
25
鍒?/p>
)
1
.
(2015路閲嶅簡娴嬭瘯
)
浠ュ潗鏍囧師鐐逛负鏋佺偣
,
x
杞寸殑姝ｅ崐杞翠负鏋佽酱寤虹珛鏋佸潗鏍囩郴
,
鏇茬嚎
C
鐨勬瀬鍧?
鏍囨柟绋嬩负
蟻=
4cos
胃
,
鐩寸嚎
l
鐨勫弬鏁版柟绋嬩负
(
t
涓哄弬鏁?/p>
),
鑻ョ洿绾?/p>
l
灏嗘洸绾?/p>
C
鐨?
鍛ㄩ暱鍒嗕负
1
鈭?/p>
5,
鍒欏疄鏁?/p>
a=
.
-
1
鎴?/p>
5
銆愯В鏋愩�戞洸绾?/p>
C
鐨勭洿瑙掑潗鏍囨柟绋嬩负
x
2
+y
2
=
4
x
,
鏍囧噯鏂圭▼涓?/p>
(
x-
2)
2
+y
2
=
4,
鐩寸嚎
l
鐨勬櫘
閫氭柟绋嬩负
x+
y-a=
0,
鐩寸嚎
l
灏嗘洸绾?/p>
C
鐨勫懆闀垮垎涓?/p>
1
鈭?/p>
5,
鍒欏鸡鎵�瀵圭殑鍦嗗績瑙掓槸
60掳,鍒欏渾蹇?
(2,0)
鍒扮洿绾?/p>
l
鐨勮窛绂讳负
,
鍗?
,
瑙ｅ緱
a=-
1
鎴?/p>
5
.
2
.
(2015路婀樻江涓夋ā
)
浠ュ潗鏍囧師鐐逛负鏋佺偣
,
x
杞寸殑姝ｅ崐杞翠负鏋佽酱寤虹珛鏋佸潗鏍囩郴
,
鏇茬嚎
C
鐨勬瀬鍧?/p>
鏍囨柟绋嬩负
蟻=
2cos
胃
,
鐩寸嚎
l
鐨勫弬鏁版柟绋嬩负
(
t
涓哄弬鏁?/p>
),
鍒欑洿绾?/p>
l
涓庢洸绾?/p>
C
鐨勪氦
鐐圭殑鐩磋鍧愭爣涓?/p>
.
(0,0)
鍜?/p>
銆愯В鏋愩�戠敱鏇茬嚎
C
鐨勬瀬鍧愭爣鏂圭▼涓?/p>
蟻=
2cos
胃
,
鍙寲涓?/p>
蟻
2
=
2
蟻
cos
胃
,
杞?
鍖栦负鐩磋鍧愭爣鏂圭▼鍙緱
x
2
+y
2
-
2
x=
0,
鎶?/p>
浠ｅ叆鍙緱
t=
0
鎴?/p>
t=
,
鏁呯洿绾?/p>
l
涓庢洸绾?/p>
C
鐨?
浜ょ偣鍧愭爣涓?/p>
(0,0)
鍜?/p>
.
3
.
(2015路椹瀺灞辫川妫�
)
浠ュ钩闈㈢洿瑙掑潗鏍囩郴鐨勫師鐐逛负鏋佺偣
,
浠?/p>
x
杞寸殑姝ｅ崐杞翠负鏋佽酱
,
寤虹珛鏋佸潗
鏍囩郴
,
鍒欐洸绾?/p>
(
蠁
涓哄弬鏁?/p>
,
蠁
鈭?/p>
R
)
涓婄殑鐐瑰埌鏇茬嚎
蟻
(cos
胃+
sin
胃
)
=
4(
蟻
,
胃
鈭?/p>
R
)
鐨勬渶鐭窛绂绘槸
.