[中學] 因數問題
EX:使n/6,n^2/324,n^3/196,n^4/486均為自然數的最小正整數,n=?
sol: n/2x3 n^2/(2^2X3^4) n^3/(2^2X7^2) n^4/(2X3^5) 均為自然數
>n>= 2X(3^2)X7=126 n的最小值=126
我不知道 n的最小值為什麼是 2X(3^2)X7 ?????
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