解一个数列通项的公式
解一个数列通项的公式
11,11,12,12,13,13,14,14……
11,11,12,12,13,13,14,14……
数学人气:484 ℃时间:2020-05-19 01:51:14
优质解答
an=(10.5+0.5*n)*|sin(nπ/2)|+(10+n/2)*|cos(nπ/2)| n为奇数时,sin(nπ/2)=1,-1,1,-1这样循环出现,取绝对值后,成为1,1,1,.同时,cos(nπ/2)=0.n为偶数时,sin(nπ/2)=0,cos(nπ/2)=1,-1,1,-1循环出现,取绝对值后为1,...
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