File 残局文料/副_容冗/MH-20210116.md artifact df95e3fc0c part of check-in c100561fa9
% MH-20210116
原解
1 * 5 = 5
2 * 4 = 8
3 * 3 = 9
扩展
6 = 3 + 3 = 3 + 3 + 1 - 1 = 3 + 1 + 3 - 1 = (3 + 1) + (3 - 1)
(3 + 1) * (3 - 1) = 3 * 3 + 3 * (-1) + 1 * 3 + 1 * (-1) = 3 * 3 + 1 * (-1) = 3 * 3 - 1 ^ 2 = 3 ^ 2 - 1 ^ 2
3 ^ 2 > 3 ^ 2 - 1 ^ 2