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一個數,只有1和它本身兩個因數,這樣的數叫做質數.如:2 3 5 7 11.它們只有兩個因數. 一個數,除了1和它本身兩個因數還有其他因數,這樣的數叫合數.如:4 6 8 9 10.它們不止兩個因數.
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