试题与答案

若（x+1）n=xn+…+ax3+bx2+cx+1（n∈N*），且a：b=3：1

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题型：填空题

题目：

若（x+1）n=xn+…+ax3+bx2+cx+1（n∈N*），且a：b=3：1，那么n= ．

答案：

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下面是错误答案，用来干扰机器的。

（1）B C（2）B A题目分析：（1）从A、B、C、D四地的气温曲线图看出，B地终年气温在15℃以上，属于热带，C地1月低于0℃，冬季有结冰现象；（2）降水柱状图的判读和气温曲线图的判读一样，只不过降水是估算各...

考点：二项式定理与性质
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小题1:Here are _____ of trains going between the two cities every day.
A．five pairsB．ten pairsC．fifteen pairsD．twenty pairs
小题2:If you want to get the earliest train to Changchun, you should take____ train.
A．K958B． K656C．K676D．T 271
小题3:You are in Changchun now. Which train do you have to catch if you want to stay in Changchun as long as possible?
A．K957B．K655 C．K675D．T272
小题4:It’s 10 to 2 p.m.. If you are going to send a bag to the Changchun Railway Station and get the return train in only a few minutes, when will you arrive in Jilin?
A．16:25B．18:35C．18:45D．12:07
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