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質數又稱素數.指在一個大於1的自然數中,除了1和此整數自身外,沒法被其他自然數整除的數.換句話說,只有兩個正因數(1和自己)的自然數即為素數.57=3*1987=3*2989=1*8949=7*7 所以只有 89 是質數.100以內的質數如下:2...
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