(3)
(2)
(1)
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3
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3
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3
A
2
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1
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1
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1
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A
C
2
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2
B
2
C
2
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B
C
A
1
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1
C
1
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2
C
1
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1
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1
C
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A
鈥?/p>
鍥?/p>
4
2010
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锛?/p>
2010
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9
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28
锛?/p>
2010
绾㈡渤鑷不宸烇級
15.
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4
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1
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A
1
銆?/p>
B
1
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C
1
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ABC
鐨勮竟
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銆?/p>
AB
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2
锛?
涓紝
A
2
銆?/p>
B
2
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C
2
鍒嗗埆鏄柍
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1
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1
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1
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1
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1
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1
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1
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1
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1
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n
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3n
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.
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)
灏忔槑鐜╀竴绉嶇殑娓告垙
,
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:
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2
3
4
5
6
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2
6
12
20
30
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.
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12
(2010
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)
濡傚浘锛岃彵褰?/p>
ABCD
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AB
=2
锛屸垹
C
=60
掳
,
鑿卞舰
ABCD
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l
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60
掳鍙竴娆℃搷浣滐紝
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36
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O
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(
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蟺
)
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锛?/p>
绛旀锛?/p>
8
3
+4
锛?/p>
蟺
O
A
B
C
(
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16
棰?/p>
)
l
D