67.54.46.35.29.( )括号里应该填什么?什么规律?

问题描述:

67.54.46.35.29.( )括号里应该填什么?什么规律?

67 -54 =13 ; 54 -46 = 8 ; 13 - 8 = 5 54 -46 = 8 ; 46 - 35 = 11 ; 8 -11 = -3 46 - 35 = 11 ; 35 - 29 = 6 ; 11 -6 = 5 6 - = -3 =6 3 =9 29 -9 = (20) 则答案是20