高数微积分!级数题目!求详解!图中划圈的题

2025-05-10 17:12:37
推荐回答(1个)
回答1:

=∑(1/2)^n+(1/3)^n
=(1/2)*1/(1-1/2)+(1/3)*1/(1-1/3)
=1+1/2