涓撻浜?/p>
鏁板垪瑙勮寖绛旈绀鸿寖
銆愬吀渚嬨�?/p>
(12
鍒?(2017路澶╂触鍗?/p>
)
宸茬煡
{
a
n
}
涓虹瓑宸暟鍒楋紝鍓?/p>
n
椤瑰拰涓?/p>
S
n
(
n
鈭?/p>
N
*
)
锛?/p>
{
b
n
}
鏄椤?/p>
涓?/p>
2
鐨勭瓑姣旀暟鍒楋紝涓斿叕姣斿ぇ浜?/p>
0
锛?/p>
b
2
锛?/p>
b
3
锛?/p>
12
锛?/p>
b
3
锛?/p>
a
4
锛?/p>
2
a
1
锛?/p>
S
11
锛?/p>
11
b
4
.
(1)
姹?/p>
{
a
n
}
鍜?/p>
{
b
n
}
鐨勯�氶」鍏紡锛?/p>
(2)
姹傛暟鍒?/p>
{
a
2
n
b
n
}
鐨勫墠
n
椤瑰拰
(
n
鈭?/p>
N
*
).
[
淇℃伅鎻愬彇
]
鉂?/p>
鐪嬪埌姹傜瓑宸暟鍒?/p>
{
a
n
}
鍜岀瓑姣旀暟鍒?/p>
{
b
n
}
鐨勯�氶」鍏紡锛屾兂鍒板埄鐢ㄥ熀鏈噺娉曞垎鍒眰绛夊樊銆佺瓑姣旀暟
鍒楃殑鍏樊鍜屽叕姣旓紱
鉂?/p>
鐪嬪埌姹傛暟鍒?/p>
{
a
2
n
b
n
}
鐨勫墠
n
椤瑰拰锛屾兂鍒板埄鐢ㄩ敊浣嶇浉鍑忔硶姹傛暟鍒楃殑鍓?/p>
n
椤瑰拰
.
[
瑙勮寖瑙ｇ瓟
]