英语翻译In a list of numbers,the first number is 3.the second is 4.and each subsequent number is the sum of all the proceeding numbers in the list.If the 20th number in the list is x.what is the 25th number in the list?

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英语翻译In a list of numbers,the first number is 3.the second is 4.and each subsequent number is the sum of all the proceeding numbers in the list.If the 20th number in the list is x.what is the 25th number in the list?
英语翻译
In a list of numbers,the first number is 3.the second is 4.and each subsequent number is the sum of all the proceeding numbers in the list.If the 20th number in the list is x.what is the 25th number in the list?

英语翻译In a list of numbers,the first number is 3.the second is 4.and each subsequent number is the sum of all the proceeding numbers in the list.If the 20th number in the list is x.what is the 25th number in the list?
翻译：
在某数字序列中,第一个数字为3,第二个为4,随后的每个数字都是它前面出现的所有数字之和.如果第20个数字为x,请问第25个数字是多少?
其实一项一项算也是可以的,不过太大了.可以直接用x来表示：
数序值
20th x
21th 2x
22th 4x
23 8x
24 16x
25 32x

在一个数列中，第一个数是3，第二个数是4，接下来的没一个数字是前面出现数字之和。如果第20个数是X，第25个数是什么？

有一列数字，第一个是13.第二个是4。且后面的每位数字是这一列数字程式的和。如果第20个数字是X，那么第25个数字是多少

假设一串数字，第一个是3，第二个是4，之后每一个数字都是前面所有数字的总和。如果第二十个数是x，那么第25个数字是多少。
这个题目看起来很复杂其实很简单，而且答案一定是7的倍数。原因是，第三个数等于前两个数之和也就是7，第四个数为前三个数之和，也就是2*7，第五个数是前四个数之和，就是2^2*7=28,第六个数是2^3*7=56，也就是说第n个数是2^（N-3）*7（N>=3）,第25个数...

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在一组数列中，第一个数字是3，第二个数字的4，随后的每个数字都是数列中在它之前的所有数字加起来的总和。如果数列中第20个数字是X的话，那么第25个数字是多少？
从题目的描述我们得知，这个数列是这样的，
3，4，7，14，28，56，112……
从第三位开始，规律就是7乘以2的（n-3）次方，那么第20位数字就是7乘以2的17次方，也就是X，第25位数是7乘以2的22次方，相...

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