用描述法表示下列集合:{1,3分之1,7分之1,9分之1}
人气:102 ℃ 时间:2020-04-08 18:13:35
解答
{x|x=1/(2k-1),k∈Z+}
如果只到9分之1
那么可以
表示为
{x|x=(2k-1)分之1,1≤k≤5,k∈Z+}
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