Each number is the sum of the previous two numbers. What were the first two numb

游客2024-08-10  15

问题 Each number is the sum of the previous two numbers. What were the first two numbers that started the series?

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答案 2.5

解析 (设19和81之间的数字为x,y,则19+x=y,x+y=81,得x=31,y=50。则后四个数分别为19,31,50,81。则前四个数从后往前可推知分别是12,7,5,2。)
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