Solution 1: Three addition sequences, three of which add up to 1 1,18,32,7, where the difference should be 2 1, the addition is 53, and then 53-17-9. Solution 2. -6 = 2 1, the answer is 27, which seems to be the original question of the national civil service examination, and the answer is 45, but there is no solution to 45 on the internet at present, 2 3 6 9 17 () 1 3 3 8? 8=(3- 1)(3 1) ? =(8- 1)(3 1) =28 2 3 6 9 17 (45) 1 3 3 8 28

I saw it in other places, classmates. Make good use of Baidu. Du Niang is not a vegetarian.