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複數是很大的數集,複數由實部和虛部够成,虛部為0,就是實數了.實數小點,跟複數區別就是沒有虛部,包括正數負數和零等,有理數是能開方的,無限迴圈的都是有理數,整數字面理解就行了,正整數負整數和零,自然數不包括負數包括零,要搞清數集問題建議你查閱數學數集,找他們的定義和區別,理解去記憶.
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