翻譯:
在某數(shù)字序列中,第一個數(shù)字為3,第二個為4,隨后的每個數(shù)字都是它前面出現(xiàn)的所有數(shù)字之和.如果第20個數(shù)字為x,請問第25個數(shù)字是多少?
其實一項一項算也是可以的,不過太大了.可以直接用x來表示:
數(shù)序 值
20th x
21th 2x
22th 4x
23 8x
24 16x
25 32x
英語翻譯
英語翻譯
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?
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?
英語人氣:990 ℃時間:2020-03-15 16:45:19
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