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題意:自然數a,b,ab+11為合數(合數:在大於1的自然數裏,能被1和自身之外的數整除的數,如4,6,9),則a+b最小是多少? 由於ab+11為合數,a,b為自然數,故ab+11可取12,14,15,16…… 當ab+11=12時,a=b=1,此時a+b=2滿足題意,且最小.
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