✨ 最佳解答 ✨
令 138 = n
a = n^2 + (n + 1)(n + 2) - 4
= n^2 + n^2 + 3n - 2
= 2n^2 + 3n - 2
= (n + 2)(2n - 1)
= 140 × 275
= 140 × 55 × 5
✨ 最佳解答 ✨
令 138 = n
a = n^2 + (n + 1)(n + 2) - 4
= n^2 + n^2 + 3n - 2
= 2n^2 + 3n - 2
= (n + 2)(2n - 1)
= 140 × 275
= 140 × 55 × 5
看了這個問題的人
也有瀏覽這些問題喔😉