按规律填数字25.25.23.28.21.31..34.17

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按规律填数字25.25.23.28.21.31..34.17按规律填数字25.25.23.28.21.31..34.17按规律填数字25.25.23.28.21.31..34.171925-2=23,

按规律填数字25.25.23.28.21.31..34.17
按规律填数字25.25.23.28.21.31..34.17

按规律填数字25.25.23.28.21.31..34.17
19
25-2=23,23-2=21,21-2=19,19-2=17
25+3=28,28+3=31,31+3=34

19
中间隔一个数看