有無數個，例如10、20、30、40、50等。倍數是指一個數和一整數的乘積。
針對兩個數a和b，若存在一整數n使得b=na，則b是a的倍數；若a不為零，也就表示b/a為一整數，其除法可以整除，沒有餘數。2的倍數，也稱為偶數。若a和b都是整數，b是a的倍數，則a是b的因數。
哪些數是2的倍數又是5的倍數
更新时间：2026-09-02 00:29:49
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