Fill in 5,5,10,30120, (), (), 25200 according to the rule

Fill in 5,5,10,30120, (), (), 25200 according to the rule

Fill in 600 and 3600 because 5 * 1 = 5 5 * 2 = 10 10 * 3 = 30 30 * 4 = 120 * 5 = 600 600 * 6 = 3600 3600 * 7 = 25200

Fill in the figures according to the regulations
（1）2,3,5,8,12,（）；
（2）2,3,5,8,13,（）；

The difference between two adjacent numbers is 1.2.3.4
From the third, each number is equal to the sum of the first two numbers
Answer: 17 and 21

Rules for finding negative numbers in mathematical problems
-1.2, - 3.4, - 5, [], [], []. What is the 81st number and what is the 2005 number

-81
-2005

2.5, 1.25, 0.625______ ，0.15625．

According to the law: 2.5, 1.25, 0.625, 0.3125, 0.15625