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樓主, 只有1和它本身兩個因數的數,就是質數(或素數). 除了1和它本身以外,還有別的因數的數,就是合數. 我也是忘帶了數學書,可是工作上要填寫這個概念,我就找啊找,終於在老師發的口算上找到了,還和數學書上的概念一模一樣!
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