若(5+4x)n展开式中各项二项式系数之和为an,(3x2+9x)n展开式中各项

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问题:

若(5+4x)n展开式中各项二项式系数之和为an(3x2+9
x
)n
展开式中各项系数之和为bn,则
lim
n→∞
an-2bn
3an+4bn
=(  )
A.
1
2
B.-
1
2
C.
1
3
D.-
1
7
考点:函数的极值与导数的关系二项式定理与性质
题型:选择题

鲜或干的白果

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管理者最有用的比率是()。

A.完成经营指标的程度

B.竞争对手的优势和劣势

C.客人满意和不满意的原因

D.特殊问题及解决方案

题型:选择题

我国基金业在发展中表现出来的特点有( )。

A.基金规模不断扩大,成为证券市场重要参与力量

B.基金投资者迅速增长,管理人、托管人队伍也逐渐扩大

C.基金品种不断创新,基金运作逐步规范

D.银行仍然为基金销售主渠道,多元化销售渠道已经形成

题型:选择题

Partha has withdrawn its troops from Baltia after five years of occupation. Earlier this year the country of Cardena began shipping mules to Baltia’s resistance fighters to facilitate transport of weapons across Baltia’s mountains to the battle areas. Cardena’s diplomats now claim that without Cardena’s aid to Baltia’s resistance fighters, Partha would not have withdrawn.
Which of the following, if true, casts the most serious doubt on the accuracy of the assertion of Cardena’s diplomats

A.No precise figures are available concerning the number of mules shipped to Baltia.

B.During the past year, Cardena shipped weapons and food, as well as mules, to resistance fighters in Baltia.

C.Last year a new government took power in Partha and decided that national interests were not served by the occupation of Baltia.

D.Two years ago Partha had no plans to reduce its forces in Baltia.

E.(E) Resistance fighters in Baltia fought for five years against Partha’s occupying troops.

题型:选择题

在具有6个顶点的无向简单图中,当边数最少为 (26) 条时,才能确保该图一定是连通图,当边数最少为 (27) 条时,才能确保该图一定是哈密尔顿图。

给定带权的有向图,如下图所示。设该图代表一个地区的交通图,从S到T的最短路径有 (28) 条,路径的长度是 (29) ,从S出发经过每点一次且只有一次到T的路径(哈密尔顿路径)有 (30) 条。

(27)处填()。

A.11

B.12

C.13

D.55

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