✨ 最佳解答 ✨ ruby 10個月以前 5*7=35=6²-1 (6²-1)(6²+1)(6⁴+1)(6⁸+1) =(6⁴-1)(6⁴+1)(6⁸+1) =(6⁸-1)(6⁸+1) =6¹⁶-1 ans:16 留言