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#3c4e4e91-dfe6-4e47-8ef3-a6df4cc39f06基础解答题数列求通项方法数列

12. 已知数列/questionmedia/image7.png/question-media/image7.png"alt=alt=""style=style="maxwidth:100max-width:100%;max-height:2.5em;height:auto;display:inline-block;vertical-align:middle;margin:2px 4px;"loading=loading="lazy"onerror=onerror="this.style.display=this.style.display='none'"/>/>,其中/questionmedia/image68.png/question-media/image68.png"alt=alt=""style=style="maxwidth:100max-width:100%;max-height:2.5em;height:auto;display:inline-block;vertical-align:middle;margin:2px 4px;"loading=loading="lazy"onerror=onerror="this.style.display=this.style.display='none'"/>/>,满足/questionmedia/image69.png/question-media/image69.png"alt=alt=""style=style="maxwidth:100max-width:100%;max-height:2.5em;height:auto;display:inline-block;vertical-align:middle;margin:2px 4px;"loading=loading="lazy"onerror=onerror="this.style.display=this.style.display='none'"/>/>,试求数列的通项。