狗狗这题the first prime number of 404

切尔西

感觉这题丢了一些信息的，希望有哪位即将考的NN确认

NOV

顶一下，谁来补充一下。

lovesasa0820

对，其实只要确定了N就很好做了
望补充！

wisdomyilin

比较同意2楼的说法

yangli317

我也觉得2楼靠谱

gaojinye

如果按2楼理解 得这么表达吧 sum of the first prime numbers 但题干写的是number...  
我倾向 是404第一个质数的和 也就是4

doctortt

Sorry, my Chinese typing is not good.  I think it means adding all prime numbers of 404, which is 101, 2 and 2.  101+2+2 = 105

(-1) + (-1)^105 + (-1)^106 + (-1)^107 = -2

Also, in my opinion, if it means the first prime number of 404, which is 2, then it really doesn't make sense to say "the sum of the xxxxxxxxxx number of 404" because there is nothing to add!

I really think there is something missing: the word "first" is a little suspicious. Need more students to confirm this question.

chenzih

Sorry, my Chinese typing is not good.  I think it means adding all prime numbers of 404, which is 101, 2 and 2.  101+2+2 = 105

(-1) + (-1)^105 + (-1)^106 + (-1)^107 = -2

Also, in my opinion, if it means the first prime number of 404, which is 2, then it really doesn't make sense to say "the sum of the xxxxxxxxxx number of 404" because there is nothing to add!

I really think there is something missing: the word "first" is a little suspicious. Need more students to confirm this question.

-- by 会员 doctortt (2009/11/21 7:05:05)

这位仁兄才是比较靠谱的

heafland

定16楼doctor的解法，这first prime number纠结了好久没想出个所以然,没看懂为毛要2+2...

niubirs

N is the sum of the first prime number of 404这句什么意思啊？

怎么解？15、我做的数学最后一道X=-1，N is the sum of the first prime number of 404 then X+X^N+X^(N+1)+X^(N+2)=?选项有-1，-2，0，1，2，这道题是最后一道题，题没看懂，印象深刻，题干应该是没错的。我选的-2

版本二：我做的数学最后一道X=-1，N is the sum of the first prime number of 404 then X+X^N+X^(N+1)+X^(N+2)=?我记得我的选项A 是 -4

请帮助解答，谢谢！

-- by 会员 nipaan (2009/11/20 17:13:22)

404 分解因式 404=2乘2乘101.

so "the sum of the first prime number" is N=2+2=4

又因为x=-1, so , 将N=4和x=-1带入，

即x+x^n+x^(n+1)+x^(N+2)=-1+(-1)^4+(-1)^(4+1)+(-1)^(4+2)=-1+(1)+(-1)+1=0

选0.