1215 18 中间都是递加3
1311 9 中间都是递减2
15中间都是递加5
谢谢,满意望采纳.
想一想,往下填.3.6.9().().().19.17.15.().().().5.
想一想,往下填.3.6.9().().().19.17.15.().().().5.
想一想,往下填.
3.6.9().().().
19.17.15.().().().
5.10.().20 .
想一想,往下填.
3.6.9().().().
19.17.15.().().().
5.10.().20 .
数学人气:393 ℃时间:2020-06-06 08:58:23
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