瀹炵敤绮惧搧鏂囩尞璧勬枡鍒嗕韩
蹇呬慨
5
姝ｅ鸡瀹氱悊鍚屾缁冧範锛堥檮绛旀鏂颁汉鏁?/p>
A
鐗堬級
蹇呬慨
5
姝ｅ鸡瀹氱悊鍚屾缁冧範锛堥檮绛旀鏂颁汉鏁?/p>
A
鐗堬級
璇炬椂鐩爣
1
锛庣啛璁?/p>
姝ｅ鸡瀹氱悊鐨勫唴瀹癸紱
2
锛庤兘澶熷垵姝ヨ繍鐢ㄦ寮﹀畾鐞嗚В鏂滀笁瑙掑舰锛?/p>
1
锛?/p>
鍦ㄢ柍ABC
涓紝
A
锛?/p>
B
锛?/p>
C
锛?/p>
蟺
锛?/p>
A2
锛?/p>
B2
锛?/p>
C2
锛?/p>
蟺
2.
2
锛?/p>
鍦?/p>
Rt鈻矨BC
涓紝
C
锛?/p>
蟺
2
锛屽垯
ac
锛?/p>
sin_A
锛?/p>
bc
锛?/p>
sin_B. 3
锛庝竴鑸湴锛屾妸涓夎褰㈢殑涓変釜瑙?/p>
A
锛?/p>
B
锛?/p>
C
鍜屽畠浠殑瀵硅竟
a
锛?/p>
b
锛?/p>
c
鍙仛涓夎褰㈢殑鍏冪礌锛庡凡鐭ヤ笁瑙掑舰鐨勫嚑
涓厓绱犳眰鍏朵粬鍏冪礌鐨勮繃绋嬪彨鍋氳В涓夎褰紟
4
锛庢寮﹀畾鐞嗭細
鍦ㄤ竴
涓笁
瑙掑舰涓紝鍚勮竟鍜屽畠鎵�瀵硅鐨勬寮︾殑姣旂浉绛夛紝鍗?/p>
asin
A
锛?/p>
bsin
B
锛?/p>
csin
C
锛岃繖涓瘮鍊兼槸涓夎褰㈠鎺ュ渾鐨勭洿寰?/p>
2R.
涓�銆侀�夋嫨棰?/p>
1
锛庡湪鈻矨BC
涓紝瑙?/p>
A
锛?/p>
B
锛?/p>
C
鐨勫杈瑰垎鍒槸
a
锛?/p>
b
锛?/p>
c
锛岃嫢
A鈭禕鈭禖 锛?鈭?鈭?锛?/p>
鍒?/p>
a鈭禸鈭禼
绛変簬
(
)
A
锛?/p>
1鈭?鈭?
B锛?/p>
2鈭?鈭?
C
锛?鈭?鈭? D锛?鈭?鈭? 绛旀
D 2
锛庤嫢鈻矨BC
涓紝
a
锛?/p>
4
锛?/p>
A
锛?5掳锛?/p>
B
锛?0掳锛屽垯杈?/p>
b
鐨勫�间负
(
)
A.3
锛?/p>
1
B
锛?/p>
23
锛?/p>
1
C
锛?/p>
26
D
锛?/p>
2
锛?/p>
23
绛?/p>
妗?/p>
C
瑙ｆ瀽
鐢辨寮﹀畾鐞?/p>
asin
A
锛?/p>
bsin
B
锛?/p>
寰?/p>
4sin
45掳锛漛sin
60掳锛?/p>
鈭碽锛?/p>
26.
3
锛庡湪鈻矨BC
涓紝
sin2A
锛?/p>
sin2B
锛?/p>
sin2C
锛屽垯鈻矨BC
涓?/p>
(
)
A
锛?/p>
鐩磋涓夎褰?/p>
B
锛?/p>
绛夎叞鐩磋涓夎褰?/p>
C
锛?/p>
绛夎竟涓夎褰?/p>
D
锛?/p>
绛夎叞涓夎褰?/p>
绛?/p>
妗?/p>
A
瑙ｆ瀽
sin2A
锛?/p>
sin2B
锛?/p>
sin2C
鈬?/p>
(2R)2sin2A
锛?/p>
(2R)2sin2B
锛?/p>
(2R)2sin2C
锛?/p>
鍗?/p>
a2
锛?/p>
b2
锛?/p>
c2
锛?/p>
鐢卞嬀鑲″畾鐞嗙殑閫嗗畾鐞嗗緱鈻矨BC
涓虹洿瑙掍笁
瑙掑舰锛?/p>
4
锛庡湪鈻矨BC
涓紝鑻?/p>
sin A>sin B
锛屽垯瑙?/p>
A
涓庤
B
鐨勫ぇ灏忓叧绯?/p>
涓?/p>
(
)
A
锛?/p>
A>B
B
锛?/p>
A<B
C
锛嶢鈮
D锛?/p>
A
锛?/p>
B
鐨勫ぇ灏忓叧绯讳笉鑳界‘瀹?/p>
绛?/p>
妗?/p>
A
瑙ｆ瀽
鐢?/p>
sin A>sin B
鈬?/p>
2Rsi n A>2Rsin B
鈬?/p>
a>b
鈬?/p>
A>B. 5
锛庡湪
鈻矨BC
涓紝
A
锛?0掳锛?/p>
a
锛?/p>
3
锛?/p>
b
锛?/p>
2
锛屽垯
B
绛変簬
(
)
A
锛?5掳鎴?/p>
135掳
B
锛?0掳 C锛?5掳 D锛?35掳 绛旀
C
瑙ｆ瀽
鐢?/p>
asin A
锛?/p>
bsin B
寰?/p>
sin B
锛?/p>
bsin Aa
锛?sin 60掳3锛?2. 鈭礱>b锛屸埓A>B锛孊<60掳 鈭碆锛?/p>
45掳. 6锛庡湪鈻矨BC
涓紝瑙?/p>
A
锛?/p>
B
锛?/p>
C
鎵�瀵圭殑杈瑰垎鍒负
a
锛?/p>
b
锛?/p>
c
锛屽鏋?/p>
c
锛?/p>
3a
锛?/p>
B
锛?0掳锛岄偅涔堣
C
绛変簬
(
) A
锛?/p>
120掳 B锛?05掳 C锛?0掳
D
锛?5掳 绛旀
A
瑙ｆ瀽
鈭礳锛?/p>
3a
锛屸埓sin
C锛?/p>
3sin
A
锛?sin(180掳锛?/p>
30掳锛?/p>
C)
锛?sin(30掳锛?/p>
C)
锛?/p>
332sin
C
锛?/p>
12cos
C
锛?/p>
鍗?/p>
sin
C
锛濓紞
3cos
C.
鈭磘an
C锛濓紞
3.
鍙?/p>
C鈭?0掳锛?/p>
180掳)锛?/p>
鈭碈锛?20掳. 浜屻�?/p>
濉┖棰?/p>
7
锛?/p>
鍦?/p>
鈻矨BC
涓紝
AC
锛?/p>
6
锛?/p>
BC
锛?/p>
2
锛?/p>
B
锛?0掳锛?/p>
鍒?/p>
C
锛?/p>
_________.
绛旀
75掳 瑙?/p>
鏋?/p>
鐢辨寮﹀畾鐞嗗緱
2sin A
锛?sin 60掳锛屸埓sin A锛?2. 鈭礏C 锛?/p>
2<AC