鏁板绮惧搧澶嶄範璧勬枡
瑙ｇ洿瑙掍笁瑙掑舰
涓�銆侀�夋嫨棰?/p>
1.
锛?/p>
2014
鈥?/p>
娴欐睙鏉窞锛?/p>
绗?/p>
3
棰橈紝
3
鍒嗭級
鍦ㄧ洿瑙掍笁瑙掑舰
ABC
涓紝
宸茬煡鈭?/p>
C=90
掳
锛?/p>
鈭?/p>
A=40
掳
锛?/p>
BC=3
锛?/p>
鍒?/p>
AC=
锛?/p>
锛?/p>
A
锛?/p>
3
sin40
掳
B
锛?/p>
3
sin50
掳
C
锛?/p>
3
tan40
掳
D
锛?/p>
3
tan50
掳
鑰冪偣
锛?/p>
瑙?/p>
鐩磋涓夎褰?/p>
鍒嗘瀽锛?/p>
鍒?/p>
鐢ㄧ洿瑙掍笁瑙掑舰涓ら攼瑙掍簰浣欐眰寰椻垹
B
鐨勫害鏁帮紝鐒跺悗鏍规嵁姝ｅ垏鍑芥暟鐨勫畾涔夊嵆鍙眰瑙ｏ紟
瑙ｇ瓟锛?/p>
瑙?/p>
锛氣垹
B=90
掳
锕ｂ垹
A=90
掳
锕?/p>
40
掳
=50
掳
锛?/p>
鍙堚埖
tanB=
锛?/p>
鈭?/p>
AC=BC
鈥?/p>
tanB=3tan50
掳
锛?/p>
鏁呴�?/p>
D
锛?/p>
鐐硅瘎锛?/p>
鏈?/p>
棰樿�冩煡浜嗚В鐩磋涓夎褰腑涓夎鍑芥暟鐨勫簲鐢紝瑕佺啛缁冩帉鎻″ソ杈硅涔嬮棿鐨勫叧绯伙紟
2.
锛?/p>
2014
鈥?/p>
娴欐睙鏉窞锛?/p>
绗?/p>
10
棰橈紝
3
鍒嗭級
宸茬煡
AD
鈭?/p>
BC
锛?/p>
AB
鈯?/p>
AD
锛?/p>
鐐?/p>
E
锛?/p>
鐐?/p>
F
鍒嗗埆鍦ㄥ皠绾?/p>
AD
锛?/p>
灏勭嚎
BC
涓婏紟
鑻ョ偣
E
涓庣偣
B
鍏充簬
AC
瀵圭О锛?/p>
鐐?/p>
E
涓庣偣
F
鍏充簬
BD
瀵圭О锛?/p>
AC
涓?/p>
BD
鐩镐氦浜庣偣
G
锛?/p>
鍒欙紙
锛?/p>
A
锛?/p>
1
+tan
鈭?/p>
ADB=
B
锛?/p>
2
BC=5CF
C
锛?/p>
鈭?/p>
AEB+22
掳
=
鈭?
DEF
D
锛?/p>
4
cos
鈭?/p>
AGB=
鑰冪偣
锛?/p>
杞?/p>
瀵圭О鐨勬�ц川锛涜В鐩磋涓夎褰紟
鍒嗘瀽锛?/p>
杩?/p>
鎺?/p>
CE
锛岃
EF
涓?/p>
BD
鐩镐氦浜庣偣
O
锛屾牴鎹酱瀵圭О鎬у彲寰?/p>
AB=AE
锛屽苟璁句负
1
锛屽埄鐢ㄥ嬀鑲?/p>
瀹氱悊鍒楀紡姹傚嚭
BE
锛屽啀鏍规嵁缈绘姌鐨勬�ц川鍙緱
DE=BF=BE
锛屽啀姹傚嚭
BC=1
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鍒嗘瀽鍒ゆ柇鍒╃敤鎺掗櫎娉曟眰瑙ｏ紟
瑙ｇ瓟锛?/p>
瑙?/p>
锛氬鍥撅紝杩炴帴
CE
锛岃
EF
涓?/p>
BD
鐩镐氦浜庣偣
O
锛?/p>
鐢辫酱瀵圭О鎬у緱锛?/p>
AB=AE
锛岃涓?/p>
1
锛?/p>
鍒?/p>
BE=
=
锛?/p>
鈭电偣
E
涓庣偣
F
鍏充簬
BD
瀵圭О锛?/p>
鈭?/p>
DE=BF=BE=
锛?/p>
鈭?/p>
AD=1+
锛?/p>
鈭?/p>
AD
鈭?/p>
BC
锛?/p>
AB
鈯?/p>
AD
锛?/p>
AB=AE
锛?/p>
鈭村洓杈瑰舰
ABCE
鏄鏂瑰舰锛?/p>
鈭?/p>
BC=AB=1
锛?/p>