楂樹笁鏁板锛堢悊锛夌瓟妗堢
1
椤碉紙鍏?/p>
9
椤碉級
2019
骞寸煶鏅北鍖洪珮涓夌粺涓�娴嬭瘯
鏁板锛堢悊锛夎瘯鍗风瓟妗堝強璇勫垎鍙傝�?/p>
涓�銆侀�夋嫨棰橈細鏈ぇ棰樺叡
8
涓皬棰橈紝姣忓皬棰?/p>
5
鍒嗭紝鍏?/p>
40
鍒嗭紟
棰樺彿
1
2
3
4
5
6
7
8
绛旀
C
B
B
A
D
C
A
C
浜屻�佸～绌洪锛氭湰澶ч鍏?/p>
6
涓皬棰橈紝姣忓皬棰?/p>
5
鍒嗭紝鍏?/p>
30
鍒嗭紟
9
锛?/p>
1
飥?/p>
锛?/p>
10
锛?/p>
1
2
2
n
飥?/p>
飥?/p>
锛?/p>
11
锛?/p>
鐩镐氦锛?/p>
12
锛?/p>
15
2
3
2
飥?
鎴?/p>
15
鎴?/p>
3
3
15
4
飥?/p>
锛?/p>
13
锛?/p>
2
锛?/p>
14
锛?/p>
1
2
锛?/p>
3
2
锛?/p>
涓夈�佽В绛旈锛氭湰澶ч鍏?/p>
6
涓皬棰橈紝鍏?/p>
80
鍒嗭紟瑙ｇ瓟棰樺簲鍐欏嚭鏂囧瓧璇存槑锛岃瘉鏄庤繃绋嬫垨婕旂畻姝?
楠わ紟
15
锛?/p>
锛堟湰灏忛
13
鍒嗭級
瑙ｏ細
(
鈪?/p>
)
鍦?/p>
ABC
V
涓紝
1
cos
3
飥?
B
=
锛?/p>
鈭?/p>
2
2
1
2
2
sin
1
cos
1
(
)
3
3
飥?/p>
飥?/p>
飥?
B
=
B
=
锛?/p>
鈭?/p>
2
3
b=
锛?/p>
3
c
=
锛?/p>
鐢辨寮﹀畾鐞?
sin
sin
飥?/p>
b
c
B
C
寰?/p>
2
3
3
sin
2
2
3
飥?/p>
C
锛?/p>
鈭?/p>
6
sin
3
C
=
锛?/p>
(
鈪?/p>
)
鐢变綑寮﹀畾鐞?/p>
2
2
2
+
2
cos
飥?/p>
b
=
a
c
ac
B
寰?/p>
2
1
12
+
9
2
3
(
)
3
飥?/p>
飩?/p>
飩?/p>
飥?/p>
=
a
a
锛?/p>
鈭?/p>
2
2
3
0
飥?/p>
飥?/p>
a
a
=
锛?/p>
瑙ｅ緱
1
a
=
鎴?/p>
3
飥?/p>
a
=
锛堣垗锛?/p>